the GNU version of the Collaborative International Dictionary of English
adj. Depurating; tending to depurate or cleanse; depurative.
The Century Dictionary and Cyclopedia
Cleansing; purifying.
n. That which purifies.
Word Usage
"The three absorbing wells, of the Combat, the Cunette, and Saint – Mande, with their discharging mouths, their apparatus, their cesspools, and their depuratory branches, only date from 1836."