The Collaborative International Dictionary
Absterse
Absterse \Ab*sterse"\, v. t.
To absterge; to cleanse; to purge away. [Obs.]
--Sir T.
Browne.
Wiktionary
absterse
vb. (context transitive now rare English) To absterge; to cleanse; to purge away. (First attested around 1350 to 1470.)(R:SOED5: page=10)