/ Dictionary / Index T tetracoccus: Meaning and Definition of Find definitions for: tet•ra•coc•cus Pronunciation: (te"tru-kok'us), [key] — pl. -coc•ci a spherical bacterium occurring in square groups of four. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tetracid tetracycline Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language