/ Dictionary / Index J jewel block: Meaning and Definition of Find definitions for: jew'el block" Pronunciation: [key] — Naut. Naut. a block at the end of a yard or gaff for supporting a signal or ensign halyard. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jewel jewel box Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language