Dimorphism

Di`mor´phism

n.	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.

Noun	1.	dimorphism - (chemistry) the property of certain substances that enables them to exist in two distinct crystalline forms
	2.	dimorphism - (biology) the existence of two forms of individual within the same animal species (independent of sex differences)