/ Dictionary / Index J jumping bean: Meaning and Definition of Find definitions for: jump'ing bean" Pronunciation: [key] the seed of any of certain Mexican plants of the genera Sebastiania and Sapium, of the spurge family: the movements of a moth larva inside the seed cause it to move about or jump. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jump head jumping bristletail Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language