noun. a strain of bacteria that is resistant to all antibiotics.
noun. 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.
1. Noun, singular or mass See, the more bacteria are exposed to antibiotics, the greater the chance that one stray microbe will develop resistance, and start on the path to becoming a superbug.