the GNU version of the Collaborative International Dictionary of English
adj. Purifying the blood or the humors; depuratory.
The Century Dictionary and Cyclopedia
Cleansing; tending to or connected with the removal of impurities.
n. That which cleanses or purifies; specifically, in medicine, formerly, a remedy supposed to purify the blood or humors.
Word Usage
"Others regarded it as a mucous discharge, or a depurative; and others, as a salutary crisis, removing from the constitution that which oppressed the different organs."