noun
Rochelle salt
A chemical compound, potassium sodium tartrate, used in piezoelectric devices and as a laxative. Domain-specific term in chemistry and materials science.
ロッシェル塩は圧電素子に使われることがある。
Rochelle salt is sometimes used in piezoelectric elements.
From English 'Rochelle salt', named after La Rochelle, France. The exact derivation is uncertain beyond the loanword origin.