<p><strong>Noun</strong></p><ul><li>Zoology: The occurrence of two forms distinct in structure, coloration, etc., among animals of the same species. Compare sexual dimorphism.</li><li>Botany: The occurrence of two different forms of flowers, leaves, etc., on the same plant or on different plants of the same species.</li><li>Crystallography: The property of some substances of crystallizing in two chemically identical but crystallographically distinct forms.</li></ul>