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

orthostatisme: orthostatism
orthosympathique: orthosympathetic
orthotopique: orthotopic
orthotrope: orthotropic
orthoténie: orthoteny
orthoédrique: orthohedric
orthoépie: orthoepy
orthoépique: orthoepic
ortie: nettle
ortolan: ortolan bunting
orvale: clary; clary sage
orvet: slowworm
orwellien: Orwellian
oryctognosie: oryctognosy
oryctologie: oryctology
oryctologique: oryctological
oryctérope: aardvark
oréade: oread
orée: edge, border
oréotrague: klipspringer
os: bone; snag, hitch
os de seiche: cuttlefish bone, cuttlebone
os ethmoïde: ethmoid bone
os frontal: frontal bone
os hyoïde: hyoid bone
os lacrymal: lacrimal bone
os nasal: nasal bone
os occipital: occipital bone
os palatin: palatine bone
os pariétal: parietal bone
os pisiforme: pisiform bone
os sphénoïde: sphenoid bone
os temporal: temporal bone
os trapèze: trapezium
os trapézoïde: trapezoid bone
os zygomatique: zygomatic bone
oscabrion: synonym of chiton (mollusk)
oscariser: to award an Oscar to
oscarisé: Oscar-winning
oscillaire: Any filamentous diatom of the Oscillaria genus
oscillant: oscillating
oscillateur: oscillator
oscillateur de battement: beat frequency oscillator
oscillation: oscillation
oscillatoire: oscillatory
osciller: to oscillate; to wobble
oscillo: oscilloscope
oscillogramme: oscillogram
oscillographe: oscillograph
oscillographie: oscillography
oscillographique: oscillographic
oscillomètre: oscillometer
oscillométrie: oscillometry
oscilloscope: oscilloscope
osculateur: osculating
osculation: osculation
oscule: osculum
osef: abbreviation of on s'en fout
oseille: sorrel; dough, dosh, bread (money)
oser: to dare; to be allowed to