/ Dictionary / Index J jumping plant louse: Meaning and Definition of Find definitions for: jump'ing plant' louse" Pronunciation: [key] any of numerous lice, of the family Psyllidae, that feed on plant juices and are sometimes pests of fruits and vegetables. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jumping-off place jumping spider Related Content Daily Word Quiz: entomology Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language