/ Dictionary / Index L lumber jacket: Meaning and Definition of Find definitions for: lum'ber jack"et Pronunciation: [key] a short, straight, wool plaid jacket or coat, for informal wear, usually belted and having patch pockets. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lumberjack lumberman Related Content Daily Word Quiz: epoch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language