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: 
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