/ Dictionary / Index D diasystem: Meaning and Definition of Find definitions for: di•a•sys•tem Pronunciation: (dī'u-sis"tum), [key] — n. Gram. a linguistic system forming a common denominator for a group or set of dialects. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diastyle diathermancy Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language