English

Noun

Rochelle salt ‎(plural Rochelle salts)

1. (inorganic chemistry) The double salt potassium sodium tartrate tetrahydrate (KNaC₄H₄O₆·4H₂O), used for various scientific and medical purposes.
   • 1998, Georgina Ferry, Dorothy Hodgkin: A Life:

     In fact, at the current state of knowledge and technology, probably only the simplest of the structures she worked on in Cambridge, Rochelle salt, could have been fully solved at the time.

Synonyms

• Seignette salt