/ Dictionary / Index D diesis: Meaning and Definition of Find definitions for: di•e•sis Pronunciation: (dī'u-sis), [key] — pl. -ses See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diesis (Thesaurus) Dies Irae* dies non Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language