oat bran  
English
Technical (English): oat bran
Popular (English): oat bran
Spanish
Technical: salvado de avena
Popular: salvado de avena

---

oats  
English
Technical (English): oats
Popular (English): oats
Spanish
Technical: avena
Popular: avena

---

OB/GYN  
English
Technical (English): OB/GYN
Popular (English): OB/GYN
Spanish
Technical: obstetricia y ginecología
Popular: obstetricia y ginecología

---

obesity  
English
Technical (English): obesity
Popular (English): obesity
Spanish
Technical: obesidad, gordura
Popular: obesidad, gordura

---

obesity  
English
Technical (English): obesity
Popular (English): obesity
Spanish
Technical: obesidad (nf)
Popular: exceso de peso corporal por acumulación de grasa

---

obey  
English
Technical (English): obey
Popular (English): obey
Spanish
Technical: obedecer, acatar
Popular: obedecer, acatar

---

objective  
English
Technical (English): objective
Popular (English): objective
Spanish
Technical: objetivo (adj)
Popular: perceptible por los sentidos externos; meta (nf)

---

observation  
English
Technical (English): observation
Popular (English): observation
Spanish
Technical: observación (nf)
Popular: estudio de un fenómeno

---

obsession  
English
Technical (English): obsession
Popular (English): obsession
Spanish
Technical: obsesión (nf)
Popular: idea fija

---

obstetrical  
English
Technical (English): obstetrical
Popular (English): obstetrics-related
Spanish
Technical: obstétrico (adj)
Popular: relativo a la rama de la medicina que se ocupa del embarazo, del parto y del puerperio

---

obstetrician (OB)  
English
Technical (English): obstetrician (OB)
Popular (English): obstetrician (OB)
Spanish
Technical: obstetra, tocólogo(a)
Popular: obstetra, tocólogo(a)

---

obstetrics  
English
Technical (English): obstetrics
Popular (English): obstetrics
Spanish
Technical: obstetricia
Popular: obstetricia

---

obstipation  
English
Technical (English): obstipation
Popular (English): severe constipation
Spanish
Technical: constipación (nf)
Popular: estreñimiento (nm)

---

obstruction  
English
Technical (English): obstruction
Popular (English): obstruction
Spanish
Technical: obstrucción, taponamiento
Popular: obstrucción, taponamiento

---

obstruction  
English
Technical (English): obstruction
Popular (English): obstruction
Spanish
Technical: obstrucción (nf)
Popular: acción y efecto de bloquear o taponar

---

occasional  
English
Technical (English): occasional
Popular (English): occasional
Spanish
Technical: ocasional (adj)
Popular: de vez en cuando

---

occipital  
English
Technical (English): occipital
Popular (English): occipital
Spanish
Technical: occipital
Popular: occipital

---

occlusion  
English
Technical (English): occlusion
Popular (English): occlusion
Spanish
Technical: oclusión, cierre, obstrucción
Popular: oclusión, cierre, obstrucción

---

occlusion  
English
Technical (English): occlusion
Popular (English): closing
Spanish
Technical: oclusión (nf)
Popular: cierre

---

occult  
English
Technical (English): occult
Popular (English): concealed
Spanish
Technical: oculto (adj)
Popular: escondido

---

occupational disease  
English
Technical (English): occupational disease
Popular (English): occupational disease
Spanish
Technical: enfermedad laboral/ profesional
Popular: enfermedad laboral/ profesional

---

occupational exposure to HIV  
English
Technical (English): occupational exposure to HIV
Popular (English): occupational exposure to HIV
Spanish
Technical: exposición ocupacional al VIH
Popular: exposición ocupacional al VIH

---

occupational health  
English
Technical (English): occupational health
Popular (English): occupational health
Spanish
Technical: salud ocupacional
Popular: salud ocupacional

---

octopus  
English
Technical (English): octopus
Popular (English): octopus
Spanish
Technical: pulpo
Popular: pulpo

---

ocular  
English
Technical (English): ocular
Popular (English): eye-related
Spanish
Technical: ocular (adj)
Popular: perteneciente o relativo al ojo

---

oculist  
English
Technical (English): oculist
Popular (English): oculist
Spanish
Technical: oculista
Popular: oculista

---

oculogyric  
English
Technical (English): oculogyric
Popular (English): involving circular eye movements
Spanish
Technical: oculógiro (adj)
Popular: relativo al giro de los ojos; caracterizado por ello o que lo origina

---

oculomucocutaneous  
English
Technical (English): oculomucocutaneous
Popular (English): mucous membrane and skin around eyes-related
Spanish
Technical:
Popular:

---

odds ratio  
English
Technical (English): odds ratio
Popular (English): odds ratio
Spanish
Technical: razón de momios
Popular: razón de momios

---

odontologist  
English
Technical (English): odontologist
Popular (English): odontologist
Spanish
Technical: odontólogo
Popular: odontólogo

---

odontology  
English
Technical (English): odontology
Popular (English): odontology
Spanish
Technical: odontología
Popular: odontología

---

odor  
English
Technical (English): odor
Popular (English): odor
Spanish
Technical: olor
Popular: olor

---

odour  
English
Technical (English): odour
Popular (English): smell
Spanish
Technical: olor (nm)
Popular: olor (nm)

---

oedema  
English
Technical (English): oedema
Popular (English): swelling due to fluid
Spanish
Technical: edema (nm)
Popular: líquido excesivo en el tejido debajo de la piel

---

oesophagitis  
English
Technical (English): oesophagitis
Popular (English): gullet inflammation
Spanish
Technical: esofagitis (nf)
Popular: inflamación del esófago, una parte del tubo digestivo

---

oestrogen  
English
Technical (English): oestrogen
Popular (English): female hormone
Spanish
Technical: estrógeno (nm)
Popular: hormona sexual feminina

---

oil  
English
Technical (English): oil
Popular (English): oil
Spanish
Technical: aceite
Popular: aceite

---

ointment  
English
Technical (English): ointment
Popular (English): ointment
Spanish
Technical: ungüento, pomada, untamiento
Popular: ungüento, pomada, untamiento

---

okra  
English
Technical (English): okra
Popular (English): okra
Spanish
Technical: quingombó, quimbombó
Popular: quingombó, quimbombó

---

oligoelement  
English
Technical (English): oligoelement
Popular (English): trace element
Spanish
Technical: oligoelemento (nm)
Popular: elemento traza

---

oligomenorrhoea  
English
Technical (English): oligomenorrhoea
Popular (English): infrequent periods
Spanish
Technical: oligomenorrea (nf)
Popular: menstruación poco frecuente

---

oliguria  
English
Technical (English): oliguria
Popular (English): abnormally small urine output
Spanish
Technical: oliguria (nf)
Popular: secreción deficiente de orina

---

olive  
English
Technical (English): olive
Popular (English): olive
Spanish
Technical: aceituna
Popular: aceituna

---

olive oil  
English
Technical (English): olive oil
Popular (English): olive oil
Spanish
Technical: aceite de oliva
Popular: aceite de oliva

---

oncologist  
English
Technical (English): oncologist
Popular (English): oncologist
Spanish
Technical: oncólogo(a)
Popular: oncólogo(a)

---

oncology  
English
Technical (English): oncology
Popular (English): oncology
Spanish
Technical: oncología
Popular: oncología

---

oncolytic  
English
Technical (English): oncolytic
Popular (English): cancer treatment-related
Spanish
Technical: oncolítico (adj)
Popular: perteneciente o relativo a la destrucción de células tumorales; caracterizado por ella o que la causa

---

oncotic  
English
Technical (English): oncotic
Popular (English): swelling related
Spanish
Technical: oncótico (adj)
Popular: relativo a una hinchazón

---

onion  
English
Technical (English): onion
Popular (English): onion
Spanish
Technical: cebolla
Popular: cebolla

---

oophorectomy  
English
Technical (English): oophorectomy
Popular (English): removal of an ovary
Spanish
Technical: ooforectomía (nf)
Popular: extirpación o extracción de ambos ovarios

---

opalescent  
English
Technical (English): opalescent
Popular (English): opal-like
Spanish
Technical: opalescente (adj)
Popular: que parece de ópalo o que exhibe diversos colores como él

---

operation  
English
Technical (English): operation
Popular (English): operation
Spanish
Technical: operación
Popular: operación

---

operations center  
English
Technical (English): operations center
Popular (English): operations center
Spanish
Technical: centro de operaciones
Popular: centro de operaciones

---

ophthalmic  
English
Technical (English): ophthalmic
Popular (English): eye-related
Spanish
Technical: oftálmico (adj)
Popular: referente o perteneciente al ojo

---

ophthalmological  
English
Technical (English): ophthalmological
Popular (English): eye treatment-related
Spanish
Technical: oftalmológico (nm)
Popular: perteneciente o relativo a la rama de la medicina que estudia los ojos

---

ophthalmologist  
English
Technical (English): ophthalmologist
Popular (English): ophthalmologist
Spanish
Technical: oftalmólogo(a)
Popular: oftalmólogo(a)

---

ophthalmology  
English
Technical (English): ophthalmology
Popular (English): ophthalmology
Spanish
Technical: oftalmología
Popular: oftalmología

---

opiate (niet: opioid)  
English
Technical (English): opiate (niet: opioid)
Popular (English): opium-like drug
Spanish
Technical: opiata (nf)
Popular: preparado derivado del opio

---

opisthotonos  
English
Technical (English): opisthotonos
Popular (English): spasm
Spanish
Technical: opistótonos (nm)
Popular: espasmo en el que la cabeza y los talones se doblan hacia atrás y el cuerpo se arquea hacia adelante

---

opium  
English
Technical (English): opium
Popular (English): opium
Spanish
Technical: opio
Popular: opio

---

opportunistic  
English
Technical (English): opportunistic
Popular (English): disease usually excluded by body defences
Spanish
Technical: oportunista (adj)
Popular: dícese del microorganismo que produce enfermedad en determinadas circunstancias solamente

---

optic  
English
Technical (English): optic
Popular (English): optic
Spanish
Technical: óptico
Popular: óptico

---

optic  
English
Technical (English): optic
Popular (English): eye-related
Spanish
Technical: óptico (adj)
Popular: perteneciente a la vista o al nervio óptico

---

optic nerve  
English
Technical (English): optic nerve
Popular (English): optic nerve
Spanish
Technical: nervio óptico
Popular: nervio óptico

---

optimal  
English
Technical (English): optimal
Popular (English): optimal
Spanish
Technical: óptimo (adj)
Popular: más propicio o favorable

---

optometrist  
English
Technical (English): optometrist
Popular (English): optometrist
Spanish
Technical: optometrista, optómetra
Popular: optometrista, optómetra

---

optometry  
English
Technical (English): optometry
Popular (English): optometry
Spanish
Technical: optometría
Popular: optometría

---

oral  
English
Technical (English): oral
Popular (English): oral
Spanish
Technical: oral
Popular: oral

---

oral  
English
Technical (English): oral
Popular (English): oral
Spanish
Technical: oral (adj)
Popular: perteneciente o relativo a la boca; a través de la boca

---

oral cavity  
English
Technical (English): oral cavity
Popular (English): oral cavity
Spanish
Technical: cavidad oral
Popular: cavidad oral

---

oral contraceptive  
English
Technical (English): oral contraceptive
Popular (English): oral contraceptive
Spanish
Technical: anticonceptivo oral
Popular: anticonceptivo oral

---

oral health  
English
Technical (English): oral health
Popular (English): oral health
Spanish
Technical: salud oral/bucal
Popular: salud oral/bucal

---

oral hygiene  
English
Technical (English): oral hygiene
Popular (English): oral hygiene
Spanish
Technical: higiene oral/bucal
Popular: higiene oral/bucal

---

oral sex  
English
Technical (English): oral sex
Popular (English): oral sex
Spanish
Technical: sexo oral
Popular: sexo oral

---

oral vaccine  
English
Technical (English): oral vaccine
Popular (English): oral vaccine
Spanish
Technical: vacuna oral
Popular: vacuna oral

---

orange  
English
Technical (English): orange
Popular (English): orange
Spanish
Technical: naranja
Popular: naranja

---

orbital  
English
Technical (English): orbital
Popular (English): eye socket-related
Spanish
Technical: orbital (adj)
Popular: relativo a la cavidad ósea que contiene el globo ocular

---

orchitis  
English
Technical (English): orchitis
Popular (English): testicle inflammation
Spanish
Technical: orquitis (nf)
Popular: inflamación de un testículo

---

organ  
English
Technical (English): organ
Popular (English): organ
Spanish
Technical: órgano
Popular: órgano

---

organism  
English
Technical (English): organism
Popular (English): organism
Spanish
Technical: organismo (nm)
Popular: cualquier cosa viviente individual

---

orgasm  
English
Technical (English): orgasm
Popular (English): orgasm
Spanish
Technical: orgasmo, clímax
Popular: orgasmo, clímax

---

orgasm  
English
Technical (English): orgasm
Popular (English): orgasm
Spanish
Technical: orgasmo (nm)
Popular: punto más alto de la excitación sexual

---

orientation  
English
Technical (English): orientation
Popular (English): awareness of your environment
Spanish
Technical: orientación (nf)
Popular: orientación (nf)

---

orofacial  
English
Technical (English): orofacial
Popular (English): mouth and face-related
Spanish
Technical:
Popular:

---

orthodontia  
English
Technical (English): orthodontia
Popular (English): orthodontia
Spanish
Technical: ortodoncia
Popular: ortodoncia

---

orthodontist  
English
Technical (English): orthodontist
Popular (English): orthodontist
Spanish
Technical: ortodoncista
Popular: ortodoncista

---

orthopaedic  
English
Technical (English): orthopaedic
Popular (English): correcting deformity
Spanish
Technical: ortopédico (adj)
Popular: ortopédico (adj)

---

orthopedia, orthopedics  
English
Technical (English): orthopedia, orthopedics
Popular (English): orthopedia, orthopedics
Spanish
Technical: ortopedia
Popular: ortopedia

---

orthopedist  
English
Technical (English): orthopedist
Popular (English): orthopedist
Spanish
Technical: ortopedista
Popular: ortopedista

---

orthostatic  
English
Technical (English): orthostatic
Popular (English): upright posture-related
Spanish
Technical: ortostático (adj)
Popular: relativo a la posición del pie o causado por ella

---

osmolality  
English
Technical (English): osmolality
Popular (English): osmolality
Spanish
Technical: osmolalidad (nf)
Popular: concentración de partículas osmóticamente activas en solución

---

osmolarity  
English
Technical (English): osmolarity
Popular (English): osmolarity
Spanish
Technical: osmolaridad (nf)
Popular: concentración de partículas osmóticamente activas en solución

---

osmotic  
English
Technical (English): osmotic
Popular (English): osmosis-related
Spanish
Technical: osmótico (adj)
Popular: perteneciente o relativo a la difusión de un líquido a través de una membrana

---

ossicle  
English
Technical (English): ossicle
Popular (English): small bone
Spanish
Technical: osículo (nm)
Popular: huesecillo

---

ossification  
English
Technical (English): ossification
Popular (English): bone formation
Spanish
Technical: osificación (nf)
Popular: formación del hueso o de sustancia ósea

---

osteoarthritis  
English
Technical (English): osteoarthritis
Popular (English): osteoarthritis
Spanish
Technical: osteoartritis, artrosis
Popular: osteoartritis, artrosis

---

osteoarthritis  
English
Technical (English): osteoarthritis
Popular (English): osteoarthritis
Spanish
Technical: osteoartritis (nf)
Popular: inflamación articular que interesa también al hueso

---

osteodystrophy  
English
Technical (English): osteodystrophy
Popular (English): defective bone formation
Spanish
Technical: osteodistrofia (nf)
Popular: distrofia de los huesos

---

osteolysis  
English
Technical (English): osteolysis
Popular (English): bone dissolving
Spanish
Technical: osteólisis (nf)
Popular: destrucción o muerte del hueso

---

osteomalacia  
English
Technical (English): osteomalacia
Popular (English): bone softening
Spanish
Technical: osteomalacia (nf)
Popular: ablandamiento de los huesos

---

osteomyelitis  
English
Technical (English): osteomyelitis
Popular (English): bone inflammation
Spanish
Technical: osteomielitis (nf)
Popular: inflamación de la médula ósea

---

osteopathy  
English
Technical (English): osteopathy
Popular (English): osteopathy
Spanish
Technical: osteopatía
Popular: osteopatía

---

osteoporosis  
English
Technical (English): osteoporosis
Popular (English): osteoporosis
Spanish
Technical: osteoporosis
Popular: osteoporosis

---

osteoporosis  
English
Technical (English): osteoporosis
Popular (English): osteoporosis
Spanish
Technical: osteoporosis (nf)
Popular: desmineralización esquelética

---

osteotomy  
English
Technical (English): osteotomy
Popular (English): cutting a bone
Spanish
Technical: osteotomía (nf)
Popular: sección quirúrgica de parte de un hueso

---

otitis  
English
Technical (English): otitis
Popular (English): otitis
Spanish
Technical: otitis
Popular: otitis

---

otitis  
English
Technical (English): otitis
Popular (English): ear inflammation
Spanish
Technical: otitis (nf)
Popular: inflamación del oído

---

otolaryngology  
English
Technical (English): otolaryngology
Popular (English): otolaryngology
Spanish
Technical: otorrinolaringología
Popular: otorrinolaringología

---

otorhinolaryngology  
English
Technical (English): otorhinolaryngology
Popular (English): E.N.T
Spanish
Technical: otorrinolaringología (nf)
Popular: estudio de las enfermedades del oído, la nariz y la garganta

---

otorrhoea  
English
Technical (English): otorrhoea
Popular (English): weeping ear
Spanish
Technical: otorrea (nf)
Popular: derrame que tiene lugar por la oreja

---

otosclerosis  
English
Technical (English): otosclerosis
Popular (English): progressive deafness
Spanish
Technical: otosclerosis (nf)
Popular: enfermedad del laberinto óseo del oído

---

ototoxic  
English
Technical (English): ototoxic
Popular (English): damaging hearing
Spanish
Technical: ototóxico (adj)
Popular: tóxico para el órgano auditivo

---

out of control  
English
Technical (English): out of control
Popular (English): out of control
Spanish
Technical: fuera de control, sin control, desenfrenado(a)
Popular: fuera de control, sin control, desenfrenado(a)

---

outbreak  
English
Technical (English): outbreak
Popular (English): outbreak
Spanish
Technical: brote, epidemia
Popular: brote, epidemia

---

outbreak study/ investigation  
English
Technical (English): outbreak study/ investigation
Popular (English): outbreak study/ investigation
Spanish
Technical: estudio / investigación de brote
Popular: estudio / investigación de brote

---

outdoors  
English
Technical (English): outdoors
Popular (English): outdoors
Spanish
Technical: exterior, afuera, al aire libre
Popular: exterior, afuera, al aire libre

---

outpatient clinic  
English
Technical (English): outpatient clinic
Popular (English): outpatient clinic
Spanish
Technical: clínica de consulta externa
Popular: clínica de consulta externa

---

ovarian  
English
Technical (English): ovarian
Popular (English): ovary-related
Spanish
Technical: ovárico (adj)
Popular: perteneciente y/o referente al ovario

---

ovarian cyst  
English
Technical (English): ovarian cyst
Popular (English): ovarian cyst
Spanish
Technical: quiste ovárico
Popular: quiste ovárico

---

ovary  
English
Technical (English): ovary
Popular (English): ovary
Spanish
Technical: ovario
Popular: ovario

---

oven  
English
Technical (English): oven
Popular (English): oven
Spanish
Technical: horno
Popular: horno

---

over the counter medication  
English
Technical (English): over the counter medication
Popular (English): over the counter medication
Spanish
Technical: medicina de venta libre, medicamento que no requiere receta médica
Popular: medicina de venta libre, medicamento que no requiere receta médica

---

overdosage  
English
Technical (English): overdosage
Popular (English): overdose
Spanish
Technical:
Popular:

---

overdose  
English
Technical (English): overdose
Popular (English): overdose
Spanish
Technical: sobredosis
Popular: dosis excesiva

---

overt  
English
Technical (English): overt
Popular (English): overt
Spanish
Technical: declarado, abierto
Popular: declarado, abierto

---

overweight  
English
Technical (English): overweight
Popular (English): overweight
Spanish
Technical: sobrepeso
Popular: sobrepeso

---

overwhelmed  
English
Technical (English): overwhelmed
Popular (English): overwhelmed
Spanish
Technical: abrumado(a), abatid(a), agobiado(a), atosigado(a), hastiado(a)
Popular: abrumado(a), abatid(a), agobiado(a), atosigado(a), hastiado(a)

---

ovulation  
English
Technical (English): ovulation
Popular (English): ovulation
Spanish
Technical: ovulación
Popular: ovulación

---

ovulation  
English
Technical (English): ovulation
Popular (English): ovulation
Spanish
Technical: ovulación (nf)
Popular: desprendimiento natural del óvulo

---

ovulation thermometer  
English
Technical (English): ovulation thermometer
Popular (English): ovulation thermometer
Spanish
Technical: termómetro de ovulación
Popular: termómetro de ovulación

---

ovum  
English
Technical (English): ovum
Popular (English): ovum
Spanish
Technical: óvulo
Popular: óvulo

---

ovum  
English
Technical (English): ovum
Popular (English): egg
Spanish
Technical: óvulo (nm)
Popular: huevo pequeño

---

owner  
English
Technical (English): owner
Popular (English): owner
Spanish
Technical: dueño(a), patrón(a)
Popular: dueño(a), patrón(a)

---

oxidation  
English
Technical (English): oxidation
Popular (English): adding oxygen
Spanish
Technical: oxidación (nf)
Popular: oxidación (nf)

---

oxygen  
English
Technical (English): oxygen
Popular (English): oxygen
Spanish
Technical: oxígeno
Popular: oxígeno

---

oxygenation  
English
Technical (English): oxygenation
Popular (English): oxygenation
Spanish
Technical: oxigenación (nf)
Popular: transporte y saturación de oxígeno

---

oxytocic  
English
Technical (English): oxytocic
Popular (English): inducing a baby
Spanish
Technical: oxitócico (adj)
Popular: que acelera el parto

---

oxytocin  
English
Technical (English): oxytocin
Popular (English): oxytocin
Spanish
Technical: oxitocina
Popular: oxitocina

---

oyster  
English
Technical (English): oyster
Popular (English): oyster
Spanish
Technical: ostra, ostión
Popular: ostra, ostión

---

ozone  
English
Technical (English): ozone
Popular (English): ozone
Spanish
Technical: ozono
Popular: ozono

---