Source : Webster's Revised Unabridged Dictionary (1913)

Petrification \Pet`ri*fi*ca"tion\, n. [Cf. F. p['e]trification.
   See {Petrify}.]
   1. See {Petrifaction}.

   2. Fig.: Obduracy; callousness. --Hallywell.

Source : WordNet®

petrification
     n : the process of turning some plant material into stone by
         infiltration with water carrying mineral particles
         without changing the original shape [syn: {petrifaction}]