Source : Webster's Revised Unabridged Dictionary (1913)

Expurgatory \Ex*pur"ga*to*ry\, a. [Cf. F. expurgatoire.]
   Serving to purify from anything noxious or erroneous;
   cleansing; purifying. ``Expurgatory animadversions.'' --Sir
   T. Browne.

   {Expurgatory Index}. See {Index Expurgatorius}, under
      {Index}.