/ Dictionary / Index D diastema: Meaning and Definition of Find definitions for: di•a•ste•ma Pronunciation: (dī"u-stē'mu), [key] — pl. -ma•ta the modified protoplasm at the equator of a cell, existing before mitotic division. a space between two teeth, esp. a space between a canine and an incisor of the upper jaw into which a lower canine occludes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diastema (Thesaurus) diastem diaster Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language