pyrosis vs reflux

pyrosis

noun
  • A burning sensation in the chest due to reflux of stomach contents in the esophagus. 

reflux

noun
  • The leaking of stomach acid up into the oesophagus. 

  • A technique, using a reflux condenser, allowing one to boil the contents of a vessel over an extended period. 

  • The backwards flow of any fluid. 

verb
  • To boil a liquid in a vessel having a reflux condenser 

  • To flow back or return. 

How often have the words pyrosis and reflux occurred in a corpus of books? (source: Google Ngram Viewer )