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2,133 words — headwords with part of speech, pronunciation, and a plain-language definition.

oxysulfure: oxysulfide / oxysulphide
oxyton: oxytone (having the stress or an acute accent on the last syllable)
oxytétrafluorure: oxytetrafluoride
oxyure: pinworm
oxyurose: oxyurosis
oxépane: oxepane
oxépine: oxepine
oxétane: oxetane
oyant: one who hears a case
oyat: European beachgrass, marram, marram grass
ozaphane: a form of cellulose acetate used as film stock
ozocérite: ozocerite
ozokérite: ozokerite
ozonateur: synonym of ozoniseur
ozone: ozone (O₃)
ozoner: to ozonate
ozoneur: synonym of ozoniseur
ozonide: ozonide
ozonisateur: synonym of ozoniseur
ozonisation: ozonization
ozoniser: to ozonize
ozoniseur: ozonizer
ozonolyse: ozonolysis
ozonosphère: ozonosphere
ozène: ozaena
oïdium: powdery mildew
oïl: yes
oïlitan: langue d'oïl
oïlitan: langue d'oïl
où: where (interrogative); where (relative pronoun); at that time; when; whither, to where
où que: wherever
où sont les neiges d'antan: where are the snows of yesteryear (Used to emphasize that life or time passes quickly.)
où va le monde: what is this world coming to?