Seidlitz powders
plural noun
Seid·litz powders ˈsed-ləts- 
: effervescing salts consisting of one powder of sodium bicarbonate and Rochelle salt and another of tartaric acid that are mixed in water and drunk as a mild cathartic
Word History
Etymology
Sedlitz (Sedlčany), village in Bohemia; from the similarity of their effect to that of the water of the village
First Known Use
1815, in the meaning defined above
Medical Definition
Seidlitz powders
noun plural
Seid·litz powders ˈsed-ləts-
: effervescing salts that consist of two separate powders with one made up of 40 grains of sodium bicarbonate mixed with 2 drams of Rochelle salt and the other of 35 grains of tartaric acid and that are mixed in water and drunk while effervescing as a mild cathartic