Pȳ-rō'sis, n.

n. [Gr. πυρώσις, a burning, an inflammation, from πυροῦν, to burn, from πῦρ, πυρός, fire; Fr. pyrose, pyrosie.] (Med.) A disease of the stomach, attended with a sensation of burning in the epigastrium, accompanied with an eructation of watery fluid, usually insipid, but sometimes acrid;—commonly called water-brash.