say it: pah-lee-MAWR-fizm
polymorphism is a noun meaning "(genetics) the genetic variation within a population that natural selection can operate on". It carries 3 recorded senses.
(genetics) the genetic variation within a population that natural selection can operate on
genetics
(chemistry) the existence of different kinds of crystal of the same chemical compound
chemistry
(biology) the existence of two or more forms of individuals within the same animal species (independent of sex differences)
biology
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for polymorphism come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.