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di·mor·phism

dimorphism

 
pronunciation:
daI mor fih zm
part of speech: noun
definition 1: the existence of two forms of a species that differ in morphology as, for example, in sexual dimorphism of birds.
definition 2: the existence within a single organism of two different forms of the same part, such as two different forms of leaf in the same plant.
definition 3: in chemistry, the existence of two different crystalline forms of a substance.