/ Dictionary / Index R rash: Meaning and Definition of Find definitions for: rash Pronunciation: (rash), [key] — -er, -est. acting or tending to act too hastily or without due consideration. characterized by or showing too great haste or lack of consideration: rash promises. rash Pronunciation: (rash), [key] — n. an eruption or efflorescence on the skin. a multitude of instances of something occurring more or less during the same period of time: a rash of robberies last month. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rash (Thesaurus) rase rasher Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language