/ Dictionary / Index S streptococcus: Meaning and Definition of Find definitions for: strep•to•coc•cus Pronunciation: (strep"tu-kok'us), [key] — pl. -coc•ci any of several spherical or oval bacteria of the genus Streptococcus, occurring in pairs or chains, certain species of which are pathogenic for humans, causing scarlet fever, tonsillitis, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: streptococcus (Thesaurus) streptocarpus streptodornase 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