/ Dictionary / Index H heat-seal: Meaning and Definition of Find definitions for: heat-seal Pronunciation: (hēt'sēl"), [key] — v.t. to wrap in clear plastic and make airtight by applying heat to seal the edges. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heat reservoir heat shield 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