/ Dictionary / Index B beast of burden: Meaning and Definition of Find definitions for: beast' of bur'den Pronunciation: [key] an animal used for carrying heavy loads or pulling heavy equipment, as a donkey, mule, or ox. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. beastly beast of prey Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language