/ Dictionary / Index L lap belt: Meaning and Definition of Find definitions for: lap' belt" Pronunciation: [key] (in a motor vehicle) a seat belt secured to the framework of a seat and fastening across the lap of a driver or a passenger. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. La Paz lapboard Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language