<p><strong>Adjective</strong></p><ul><li>Having the same or a similar relation; corresponding, as in relative position or structure.</li><li>Corresponding in structure and in origin, but not necessarily in function: The wing of a bird and the foreleg of a horse are homologous.</li><li>Having the same alleles or genes in the same order of arrangement: homologous chromosomes.</li><li>Chemistry: Of the same chemical type, but differing by a fixed increment of an atom or a constant group of atoms: Methyl and ethyl alcohols are homologous.</li><li>Immunology: Pertaining to an antigen and its specific antibody.</li></ul>