/ Dictionary / Index S streptobacillus: Meaning and Definition of Find definitions for: strep•to•ba•cil•lus Pronunciation: (strep"tō-bu-sil'us), [key] — pl. -cil•li any of various bacilli that form in chains. any of the Gram-negative bacteria of the genus Streptobacillus, common in rat saliva and a cause of ratbite fever. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: streptobacillus (Thesaurus) strepto- streptocarpus 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