/ Dictionary / Index J jarful: Meaning and Definition of Find definitions for: jar•ful Pronunciation: ( jär'fool), [key] — pl. -fuls. the amount that a jar can hold. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: jarful (Thesaurus) Jaredite jargon Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language