i Register
In some senses, abstersive is marked as archaic. Watch for register when choosing this word.
adj
Cleansing; purging; abstergent.
If he cannot digeſt a ſtrong and abſterſive drugge, for to remove his evill, let him at leaſt take a lenitive pill to eaſe the ſame.
Therefore it is good, after Purging, to vſe Apozumes, and Broths, not ſo much Opening as thoſe vſed before Purging, but Abſterſiue and Mundifying Cliſters alſo are good to conclude with, to draw away the Reliques of the Humours, that may haue deſcended to the Lower Region of the Body.
noun
Something cleansing; detergent; abstergent.
[…]the ſtrong abſterſive of ſom heroick magiſtrat[…]