Source : Webster's Revised Unabridged Dictionary (1913)

Homologue \Hom"o*logue\, 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.