chalybeate vs ferric

chalybeate

adj
  • Containing dissolved salts of iron. 

  • Tasting of iron, said of mineral water. 

noun
  • A mineral water containing iron, a voguish general remedy during the 17th-19th century. 

ferric

adj
  • Of compounds of iron in which it has a valence or oxidation number of 3 

  • Pertaining to, derived from, or containing iron. 

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