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octa-, octo-, oct-, octi-, octon- (Greek > Latin: a number used as a prefix; eight, eighth).


octachord:
octad:
octagon:
octagonal:
octagynous:
octahedral:
octahedrite:
octahedron:
octamerous:
octameter:
octandrous:
octane:
octangular:
octant:
octarchy:
octave:
octavo:
octennial:
octet:
octette:
octillion:
octiparous:
October:
octodecimo:
octodont:
octogenarian:
A person who is in her/his eighties; a person who is eighty to eighty-nines years old.
octogynous:
octolateral:
octomerous:
octonocular:
octopetalous:
octoploid:
octopod:
octopus:
octosyllable:
octuple:
octuplet:
octuplicate: