1. a strain of bacteria that is resistant to all antibiotics • Hypernyms: bacteria, bacterium 2. a strain of pest accidentally imported into Florida from the Middle East then spread to California where it is a very serious pest feeding on almost all vegetable crops and poinsettias • Syn: Bemisia tabaci, poinsettia strain • Hypernyms: sweet-potato whitefly • Member Holonyms: Bemisia, genus Bemisia