Source : Webster's Revised Unabridged Dictionary (1913)

Abstersive \Ab*ster"sive\, a. [Cf. F. abstersif. See
   {Absterge}.]
   Cleansing; purging. --Bacon.

Abstersive \Ab*ster"sive\, n.
   Something cleansing.

         The strong abstersive of some heroic magistrate.
                                                  --Milton.