/ Dictionary / Index H heat shield: Meaning and Definition of Find definitions for: heat' shield" Pronunciation: [key] — Aerospace. Aerospace. a coating or structure that surrounds part of the nose cone or other vulnerable surfaces of a spacecraft and, by heat absorption or ablation, protects them from excessive heating during reentry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heat-seal heat sink Related Content Daily Word Quiz: abyss Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language