/ Dictionary / Index J jackaroo: Meaning and Definition of Find definitions for: jack•a•roo Pronunciation: ( jak"u-r'), [key] — pl. v.i., -roos, -rooed, -roo•ing. jackeroo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jack arch jackass Related Content Daily Word Quiz: cur Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language