/ Dictionary / Index J Jack Russell terrier: Meaning and Definition of Find definitions for: Jack' Rus'sell ter'rier Pronunciation: [key] any of a breed of small, compact terriers having large, erect ears and a short white coat with brown or black markings. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Jack Rose jack salmon Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language