MyomorphaPronunciation: /ˈmʌɪə(ʊ)ˌmɔːfə/Definition of Myomorpha noun Zoology a major division of the rodents that includes the rats, mice, voles, hamsters, and their relatives. Suborder Myomorpha, order Rodentia Derivatives myomorph noun & adjective Origin:modern Latin (plural), from Greek mus, mu- 'mouse' + morphē 'form'Myomorpha in other Oxford dictionaries Definition of Myomorpha in the US English dictionary