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2,220 words — headwords with part of speech, pronunciation, and a plain-language definition.

oxidoreductasa: oxidoreductase
oxidorreductasa: oxidoreductase
oxigenación: oxygenation
oxigenado: oxygenated
oxigenador: oxygenator
oxigenante: oxygenate
oxigenar: to oxygenate; to reinvigorate, to revitalize
oxigenasa: oxygenase
oxigenoterapia: oxygen therapy
oxigénico: oxygenic
oxihemoglobina: oxyhemoglobin
oxihidróxido: oxyhydroxide
oxilipina: oxylipin
oxiluciferina: oxiluciferin
oxima: oxime
oximel: oxymel
oximercuración: oxymercuration
oximetazolina: oxymetazoline
oximetría: oximetry
oxisol: oxisol
oxitocina: oxytocin
oxiuro: pinworm
oxoanión: oxoanion
oxocarbenio: oxocarbenium
oxocarbono: oxocarbon
oxonio: oxonium
oxoácido: synonym of oxácido
oxácido: oxyacid
oxálico: oxalic
oxígeno: oxygen
oxímetro: oximeter
oxímoron: oxymoron (figure of speech)
oxítono: oxytone
oyamel: sacred fir (Abies religiosa)
oye: hey! listen! (call to attract attention of a single person)
oyente: hearing
oyente: listener; hearer, hearing person; auditor, unregistered student, student who sits in lectures despite not being an official student
oyodín: iodine
ozonificador: ozonator
ozonización: ozonization
ozono: ozone
ozonoterapia: ozonetherapy
ozonólisis: ozonolysis
ozté: eye dialect spelling of usted
ozónido: ozonide
oíble: hearable
oída: hearing
oídio: powdery mildew
oído: hearing; inner ear; ear (used to refer to the ear as an internal organ, or its function of hearing)
oído cocina: got it; roger that
oído externo: outer ear
oído interno: inner ear
oído medio: middle ear
oír: to hear; to hear (passively perceive a sound); to listen to (actively pay attention to a sound or a person speaking); to heed; to listen to
oír hablar de: to hear of, to hear about
oñacino: a supporter or soldier of the Oñaz family in the War of the Bands
oñacino: of or supporting the Oñaz family in the War of the Bands
oñatiarra: of, from or relating to Oñati
oñatiarra: native or inhabitant of Oñati (usually male)
oósfera: oosphere