The Collaborative International Dictionary
Abstersion \Ab*ster"sion\, n. [F. abstersion. See Absterge.] Act of wiping clean; a cleansing; a purging.
The task of ablution and abstersion being performed.
--Sir W.
Scott.
Wiktionary
n. (context archaic English) Act of wiping clean; a cleansing; a purging. (First attested around 1350 to 1470.)(reference-book editor=Brown, Lesley title=The Shorter Oxford English Dictionary origyear=1933 edition=5th year=2003 publisher=Oxford University Press location=Oxford, UK isbn=978-0-19-860575-7 pages=9 chapter)
Usage examples of "abstersion".
And contemplating the calicular shafts, and uncous disposure of their extremities, so accommodable unto the office of abstersion, not condemne as wholly improbable the conceit of those who accept it, for the herbe Borith.