/ Dictionary / Index J Jekyll and Hyde: Meaning and Definition of Find definitions for: Jek'yll and Hyde' Pronunciation: ( jek'ul, jē'kul), [key] a person marked by dual personality, one aspect of which is good and the other bad. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jejunum jell Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language