whiteflyPronunciation: /ˈwʌɪtflʌɪ/Definition of whitefly noun (plural same or whiteflies) a minute winged bug covered with powdery white wax, which damages plants by feeding on the sap and coating them with honeydew. Family Aleyrodidae, suborder Homoptera: numerous genera and species whitefly in other Oxford dictionaries Definition of whitefly in the US English dictionary