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Webster 1913 Edition

Noun.

(Chem.)

The bitter, purgative principle of senna. It is a glucoside with the properties of a weak acid; – called also

cathartic acid

, and

cathartina

cathartin ‎(uncountable)

(organic chemistry) The bitter purgative principle of senna. It is a glucoside with the properties of a weak acid.