bacillus
noun [ C ] biology specialized uk/bəˈsɪl.əs/ us/bəˈsɪl.əs/ bacilli uk/bəˈsɪl.aɪ/ us/bəˈsɪl.aɪ/
杆菌
a bacterium (= an extremely small organism) that is shaped like a rod. There are various types of bacillus, some of which can cause disease.