/ Dictionary / Index J jumping gene: Meaning and Definition of Find definitions for: jump'ing gene' Pronunciation: [key] — Informal. Informal. transposon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jumping bristletail jumping hare Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language