- ocellation
- ocellus
- ocelot
- och
- ocher
- ochlocracy
- ochone
- ochre
- ochreous
- ochroid
- ochrous
- ocr
- ocrea
- oct-
- octachord
- octad
- octadic
- octagon
- octahedral
- octahedrite
- octal
- octamerous
- octameter
- octan
- octane
- octane number
- octangle
- octangular
- octanol
- octans
- octant
- octarchy
- octastyle
- octateuch
- octave
- octavia
- octavius
- octavo
- octennial
- octet
- octette
- octillion
- octingentenary
- octo-
- october
- octobrist
- octocentenary
- octocentenial
- octodecimo
- octogenarian
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