the GNU version of the Collaborative International Dictionary of English
n. plural of bacillus; usually designating aerobic rod-shaped spore-producing bacteria; they often occur in chainlike formations.
The Century Dictionary and Cyclopedia
n. Plural of bacillus.
Word Usage
"The poison excreted by the bacilli is the diphtheria bacilli's dangerous weapon against the human being, without which weapon they would be delivered over helplessly to the natural prophylactic power of the living human organism."