/ Dictionary / Index P pyrosis: Meaning and Definition of Find definitions for: py•ro•sis Pronunciation: (pī-rō'sis), [key] — n. Pathol. heartburn (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pyrosis (Thesaurus) pyroracemic acid pyrostat Related Content Daily Word Quiz: jovial Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language