/ Dictionary / Index D diastolic: Meaning and Definition of Find definitions for: di•as•tol•ic Pronunciation: (dī"u-stol'ik), [key] — adj. pertaining to or produced by diastole. (of blood pressure) indicating the arterial pressure during the interval between heartbeats. Cf. systolic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diastolic (Thesaurus) diastole diastrophism Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language