\Di*mor"phism\, n. [Cf. F. dimorphisme.]
1. (Biol.) Difference of form between members of the same
   species, as when a plant has two kinds of flowers, both
   hermaphrodite (as in the partridge berry), or when there
   are two forms of one or both sexes of the same species of
   butterfly.
         Dimorphism is the condition of the appearance of the
         same species under two dissimilar forms. --Darwin.
2. (Crystallog.) Crystallization in two independent forms of
   the same chemical compound, as of calcium carbonate as
   calcite and aragonite.