microvillus Syllabification: (mi·cro·vil·lus)Pronunciation: /ˌmīkrōˈviləs/Definition of microvillus noun (plural microvilli /-ˈvilˌī, -ˈvilē/) Biology each of a large number of minute projections from the surface of some cells. Derivatives microvillarPronunciation: /-ˈvilər/ adjective microvillousPronunciation: /-ˈviləs/ adjective microvillus in other Oxford dictionaries Definition of microvillus in the British & World English dictionary