homo- (1) Look up homo- at Dictionary.com
word-forming element meaning "same, the same, equal, like," before vowels hom-, from Greek homos "one and the same," also "belonging to two or more jointly," from PIE *somos (cognates: Sanskrit samah "even, the same," Lithuanian similis "like," Gothic sama "the same," samana "together;" see same).
homo- (2) Look up homo- at Dictionary.com
word-forming element meaning "homosexual," abstracted since early 20c. from homosexual, and ultimately identical to homo- (1).