/ Dictionary / Index P pyrostat: Meaning and Definition of Find definitions for: py•ro•stat Pronunciation: (pī'ru-stat"), [key] — n. a thermostat for high temperatures. a safety device that, when a fire breaks out in its vicinity, automatically causes a mechanism to sound a warning alarm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pyrostat (Thesaurus) pyrosis pyrosulfate Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language