Definition of "polymorphic" [pol•y•mor•phic]

• Relating to polymorphism (any sense), able to have several shapes or forms (adjective)

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• "This equilibrium is known as polymorphic, by contrast with the monomorphic equilibria that arise when either of the alleles has gone to fixation."
• "And this is known as a polymorphic virus or worm, in that each time it's transmitted, it comes in a different guise."
• "The ABO gene is highly polymorphic, which is thought to be related to evolutionary changes for host-pathogen interactions, as many pathogens utilize surface glycoproteins in host invasion."