WordWeb Online

1. That which is homologous to something else
   "the corresponding sides of similar polygons are the homologues of each other"; "the members of a homologous series in chemistry are the homologues of each other"; "one of the bones in the hand of man is the homologue of that in the paddle of a whale";
   - homolog [US]

Derived forms: homologues

Encyclopedia: Homologue