/ Dictionary / Index T typhoid bacillus: Meaning and Definition of Find definitions for: ty'phoid bacil"lus Pronunciation: [key] the bacterium Salmonella typhosa, causing typhoid fever. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. typhoidal typhoidin Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language