/ Dictionary / Index E eldest: Meaning and Definition of Find definitions for: eld•est Pronunciation: (el'dist), [key] — old elder oldest; first-born; of greatest age: eldest brother; eldest sister; eldest born. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: eldest (Thesaurus) elder statesman eldest hand Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language