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dimorphism (n.)

"property of having or assuming two distinct forms," 1834, especially in zoology and botany, with -ism + dimorph, from Greek dimorphos "of two forms," from di- "two" (see di- (1)) + morphe "form, shape," a word of uncertain etymology. In philology, "existence of a word under two or more forms called doublets," by 1877.

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