homologue

n. [ Cf. F. homologue. See Homologous. ] That which is homologous to something else; as, the corresponding sides, etc., of similar polygons are the homologues of each other; the members or terms of an 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. [ 1913 Webster ]