/ Dictionary / Index J jell: Meaning and Definition of Find definitions for: jell Pronunciation: ( jel), [key] — v.i. to congeal; become jellylike in consistency. to become clear, substantial, or definite; crystallize: The plan began to jell once we all met to discuss it. —v.t. to cause to jell. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: jell (Thesaurus) Jekyll and Hyde jellaba Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language