Source : Webster's Revised Unabridged Dictionary (1913)

Petrifaction \Pet`ri*fac"tion\, n. [See {Petrify}.]
   1. The process of petrifying, or changing into stone;
      conversion of any organic matter (animal or vegetable)
      into stone, or a substance of stony hardness.

   2. The state or condition of being petrified.

   3. That which is petrified; popularly, a body incrusted with
      stony matter; an incrustation.

   4. Fig.: Hardness; callousness; obduracy. ``Petrifaction of
      the soul.'' --Cudworth.

Source : WordNet®

petrifaction
     n 1: the process of turning some plant material into stone by
          infiltration with water carrying mineral particles
          without changing the original shape [syn: {petrification}]
     2: a rock created by petrifaction; an organic object
        infiltrated with mineral matter and preserved in its
        original form