/ Dictionary / Index D diplococcus: Meaning and Definition of Find definitions for: dip•lo•coc•cus Pronunciation: (dip"lu-kok'us), [key] — pl. -coc•ci any of several spherical bacteria occurring in pairs, as Diplococcus pneumoniae. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diplococcus (Thesaurus) diplocardiac diplodocus Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language