"polymorphism" in the noun sense
1. polymorphism
genetics) the genetic variation within a population that natural selection can operate on
2. polymorphism, pleomorphism
chemistry) the existence of different kinds of crystal of the same chemical compound
3. polymorphism
biology) the existence of two or more forms of individuals within the same animal species (independent of sex differences)
Source: WordNet® (An amazing lexical database of English)
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