Breadcrumb Home > Dictionary > Index H heat reservoir: Meaning and Definition of Find definitions for: heat' res"ervoir Pronunciation: [key] — Thermodynam. Thermodynam. a hypothetical body of infinitely large mass capable of absorbing or rejecting unlimited quantities of heat without undergoing appreciable changes in temperature, pressure, or density. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heat rash heat-seal 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: insipid Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language