/ Dictionary / Index L lead line: Meaning and Definition of Find definitions for: lead' line" Pronunciation: (led), [key] — Naut. Naut. a line by which a lead is lowered into the water to take soundings: in deep-sea practice, divided into levels one fathom apart, variously treated as marks and deeps. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. leading wind lead monoxide Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language