monomorphicPronunciation: /ˌmɒnə(ʊ)ˈmɔːfɪk/Definition of monomorphic adjective chiefly Biology having or existing in only one form, in particular: (of a species or population) showing little or no variation in morphology or phenotype. (of an animal species) having sexes that are similar in size and appearance. Derivatives monomorphism noun monomorphous adjective Origin: late 19th century: from mono- 'single' + Greek morphē 'form'monomorphic in other Oxford dictionaries Definition of monomorphic in the US English dictionary