pyrosis

from WordNet (r) 3.0 (2006)

pyrosis
    n 1: a painful burning sensation in the chest caused by
         gastroesophageal reflux (backflow from the stomach
         irritating the esophagus); symptomatic of an ulcer or a
         diaphragmatic hernia or other disorder [syn: {heartburn},
         {pyrosis}]

from The Collaborative International Dictionary of English v.0.48

Pyrosis \Py*ro"sis\, n. [NL., fr Gr. ? a burning, an
   inflammation, fr. ? to burn, fr. ? fire.] (Med.)
   See {Water brash}, under {Brash}.
   [1913 Webster]

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