Breadcrumb Home > Dictionary > Index V vapor barrier: Meaning and Definition of Find definitions for: va'por bar"rier Pronunciation: [key] — Building Trades. Building Trades. a layer of material, as plastic film or foil, used to protect installed insulation by retarding the transmission of moisture from the interior environment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. vapor vaporescence TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: apotheosis Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language