from the GNU version of the Collaborative International Dictionary of English
- n. Act of wiping clean; a cleansing; a purging.
from The Century Dictionary and Cyclopedia
- n. The act of wiping clean: as, “ablution and abstersion,” Scott, Waverley, xx.
- n. In medicine, a cleansing by substances which remove foulness from about sores, or humors or obstructions from the system.
Either from (Old French, or from Medieval Latin abstertion), from Latin abstersus, past participle of abstergēo. (Wiktionary)