mudminnow Syllabification: (mud·min·now)Pronunciation: /ˈmədˌminō/Definition of mudminnow noun a small stout-bodied freshwater fish of both Eurasia and North America, able to survive low concentrations of oxygen and very low temperatures. Genus Umbra, family Umbridae: several species mudminnow in other Oxford dictionaries Definition of mudminnow in the British & World English dictionary