柯林斯詞典bacillus /b??s?l?s/ (bacilli) 1. N-COUNT A bacillus is any bacterium that has a long, thin shape. 桿菌 返回 bacillus劍橋詞典a bacterium (= an extremely small organism ) that is shaped like a rod . There are various types of bacillus, some of which can cause disease . 桿菌 返回 bacillus