Ex-pŭr'ga-to-ry, a.

a. [Fr. expurgatoire.] Serving to purify from any thing noxious or erroneous; cleansing; purifying. “Expurgatory animadversions.” Browne.

Expurgatory Index [Lat. Index Expurgatorius], a catalogue of books forbidden by the Roman Catholic church to be read, as teaching things contrary to its creed or principles.