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

octadécane: octadecane
octadécanoïque: octadecanoic
octadécatriénoïque: octadecatrienoic
octadécylique: octadecylic
octadécène: octadecene
octadécènoïque: octadecenoic
octadécénoïque: octadecenoic
octal: octal
octane: octane
octanoïque: octanoic
octant: octant (all senses)
octante: eighty
octante et un: eighty-one
octante-et-un: post-1990 spelling of octante et un
octante-neuf: eighty-nine
octantenaire: eighty years old
octantenaire: eighty-year-old
octantenaire: eightieth anniversary
octantième: eightieth
octantième: eightieth
octasoufre: octasulfur
octateuque: octateuch
octatomique: octatomic
octave: octave
octaviation: octaviation (repetition of a chord an octave higher or lower than the original)
octavien: Octavian
octavier: to octavate
octavin: octavin
octavo: eighthly
octavon: octoroon
octaèdre: octahedron
octaédrique: octahedral
octaédrite: octahedrite
octet: byte (of eight bits), octet
octidi: the eighth day of the decade (ten-day week) in the French Republican Calendar
octilliard: sexdecillion (10⁵¹)
octillion: quindecillion (10⁴⁸); octillion (10²⁷)
octobre: October
octocoralliaire: octocorallian
octogonal: octagonal
octogone: octagon
octogénaire: octogenarian
octomère: octomer
octomériser: to octomerize
octonaire: octonary
octonaire: octonarius
octopode: octopod; eight-legged
octopode: octopod (creature with eight legs)
octostyle: octostyle
octosyllabe: octosyllabic
octosyllabique: octosyllabic
octovalent: octavalent
octroi: grant, granting; concession
octroyer: to grant
octuor: octet
octuple: octuple
octupler: to octuple; to multiply by eight
oculaire: eye; ocular
oculaire: eyepiece, ocular
oculairement: ocularly