/ Dictionary / Index L lay brother: Meaning and Definition of Find definitions for: lay' broth"er Pronunciation: [key] a man who has taken religious vows and habit but is employed by his order chiefly in manual labor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lay baptism lay-by Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language