/ Dictionary / Index L lead block: Meaning and Definition of Find definitions for: lead' block" Pronunciation: (lēd), [key] — Naut. Naut. any block that alters the direction of a rope; fairlead. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Leadbelly lead carbonate Related Content Daily Word Quiz: topography Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language