- the occurrence of more than one form of individual in a single species within an interbreeding population
- the existence or formation of different types of crystal of the same chemical compound
WordReference Random House Unabridged Dictionary of American English © 2026
pol•y•mor•phism
(pol′ē môr′fiz əm),USA pronunciation n.
pol′y•mor•phis′tic, adj.
- Biology, Geneticsthe state or condition of being polymorphous.
- Crystallographycrystallization into two or more chemically identical but crystallographically distinct forms.
- Genetics, Biology, Developmental Biology[Biol.]the existence of an organism in several form or color varieties.
- Genetics, Developmental Biologythe presence of two or more distinct phenotypes in a population due to the expression of different alleles of a given gene, as human blood groups O, A, B, and AB.
- polymorph + -ism 1830–40
Collins Concise English Dictionary © HarperCollins Publishers::
polymorphism /ˌpɒlɪˈmɔːfɪzəm/ n
'polymorphism' also found in these entries (note: many are not synonyms or translations):