/ Dictionary / Index A adumbral: Meaning and Definition of Find definitions for: ad•um•bral Pronunciation: (a-dum'brul), [key] — adj. shadowy; shady. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. adult respiratory distress syndrome adumbrate Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language