/ Dictionary / Index D day blindness: Meaning and Definition of Find definitions for: day' blind"ness Pronunciation: [key] hemeralopia (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. daybed daybook Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language