Source : Webster's Revised Unabridged Dictionary (1913)

Petrifactive \Pet`ri*fac"tive\, a.
   1. Having the quality of converting organic matter into
      stone; petrifying.

   2. Pertaining to, or characterized by, petrifaction.

            The . . . petrifactive mutations of hard bodies.
                                                  --Sir T.
                                                  Browne.