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

ontarien: of Ontario; Ontarian
ontogenèse: ontogenesis
ontogénie: ontogeny
ontogénique: ontogenic
ontogénéticien: ontogeneticist
ontogénétique: ontogenetic, ontogenic
ontologie: ontology (the branch of metaphysics that addresses the nature or essential characteristics of being and of things that exist)
ontologique: ontological
ontologiquement: ontologically
ontologisme: ontologism
ontologiste: ontologist
onusien: UN
onychomycose: onychomycosis (nail fungus)
onychophagie: onychophagy
onze: eleven
onzième: eleventh
onzième: eleventh
onzièmement: eleventhly
onéreusement: onerously
onéreux: onerous; expensive
oocyste: oocyst
oogame: oogamous
oogamie: oogamy
oogenèse: oogenesis
oolithe: oolite
oolithique: oolitic
oologie: oology (study of birds' eggs)
oologique: oologic
oophage: oophagous
oophagie: oophagy
oophore: oophore
oophoridie: oophoridium
oophorite: oophoritis
oosphère: oosphere
oosporose: oosporosis
oothèque: ootheca
oozoïde: oozoid
opacification: opacification
opacifier: to opacify
opacimétrie: opacimetry
opacité: opacity; opaqueness
opale: opal
opalescence: opalescence
opalescent: opalescent
opalin: opal (having an opal color)
opalisation: opalization
opaque: opaque
opaquement: opaquely
open: open; open tournament
open space: open-plan office, open-plan setting
operculaire: opercular
opercule: operculum
operculé: sealed (especially with an operculum)
ophicléide: ophicleide
ophidien: ophidian
ophidien: ophidian
ophioglosse: ophioglossid
ophiographie: ophiography
ophiolite: ophiolite
ophiologie: ophiology