polymorphism

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˌpɒlɪˈmɔːfɪzəm/US:USA pronunciation: respellingUSA pronunciation: respelling(pol′ē môrfiz əm)


WordReference Random House Unabridged Dictionary of American English © 2026
pol•y•mor•phism  (pol′ē môrfiz əm),USA pronunciation n. 
  1. Biology, Geneticsthe state or condition of being polymorphous.
  2. Crystallographycrystallization into two or more chemically identical but crystallographically distinct forms.
  3. Genetics, Biology, Developmental Biology[Biol.]the existence of an organism in several form or color varieties.
  4. 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
pol′y•mor•phistic, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::
polymorphism /ˌpɒlɪˈmɔːfɪzəm/ n
  1. the occurrence of more than one form of individual in a single species within an interbreeding population
  2. the existence or formation of different types of crystal of the same chemical compound
'polymorphism' also found in these entries (note: many are not synonyms or translations):

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