/ Dictionary / Index J jumbuck: Meaning and Definition of Find definitions for: jum•buck Pronunciation: ( jum'buk), [key] — n. Australian. a sheep. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jumbo jet Jumna 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