\Ho*mol"o*gous\, a. [Gr. ? assenting, agreeing; ? the
same + ? speech, discourse, proportion, ? to say, speak.]
Having the same relative position, proportion, value, or
structure. Especially:
(a) (Geom.) Corresponding in relative position and
    proportion.
          In similar polygons, the corresponding sides,
          angles, diagonals, etc., are homologous. --Davies &
                                               Peck (Math.
                                               Dict.).
(b) (Alg.) Having the same relative proportion or value, as
    the two antecedents or the two consequents of a
    proportion.
(c) (Chem.) Characterized by homology; belonging to the same
    type or series; corresponding in composition and
    properties. See {Homology}, 3.
(d) (Biol.) Being of the same typical structure; having like
    relations to a fundamental type to structure; as, those
    bones in the hand of man and the fore foot of a horse are
    homologous that correspond in their structural relations,
    that is, in their relations to the type structure of the
    fore limb in vertebrates.
{Homologous stimulus}. (Physiol.) See under {Stimulus}.