n. [ Gr. &unr_; two-formed; di`s- twice (see Di-) + morfh` form. ] (Crystallog.) Either one of the two forms of a dimorphous substance; as, calcite and aragonite are dimorphs. [ 1913 Webster ]

a. Having the property of dimorphism; dimorphous. [ 1913 Webster ]

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. [ 1913 Webster ]

Dimorphism is the condition of the appearance of the same species under two dissimilar forms. Darwin. [ 1913 Webster ]

2. (Crystallog.) Crystallization in two independent forms of the same chemical compound, as of calcium carbonate as calcite and aragonite. [ 1913 Webster ]

a. [ Cf. F. dimorphe. ] 1. (Biol.) Characterized by dimorphism; occurring under two distinct forms, not dependent on sex; dimorphic. [ 1913 Webster ]

2. (Crystallog.) Crystallizing under two forms fundamentally different, while having the same chemical composition. [ 1913 Webster ]