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The Collaborative International Dictionary of English v.0.48 (gcide)

Dimorphism \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.
[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]

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