/ Dictionary / Index H heat barrier: Meaning and Definition of Find definitions for: heat' bar"rier Pronunciation: [key] — Aerospace. Aerospace. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heat heat capacity Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language