The Collaborative International Dictionary of English v.0.48:

Homo- \Ho"mo-\
   A combining form from Gr. "omo`s, one and the same, common,
   joint.
   [1913 Webster]

WordNet (r) 3.0 (2006):

homo
    n 1: someone who practices homosexuality; having a sexual
         attraction to persons of the same sex [syn: homosexual,
         homophile, homo, gay]
    2: any living or extinct member of the family Hominidae
       characterized by superior intelligence, articulate speech,
       and erect carriage [syn: homo, man, human being,
       human]