/ Dictionary / Index C comma bacillus: Meaning and Definition of Find definitions for: com'ma bacil"lus Pronunciation: [key] a curved, rod-shaped bacterium, Vibrio cholerae, causing Asiatic cholera. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. comma Commack Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language