The Collaborative International Dictionary of English v.0.48:

Lapidify \La*pid"i*fy\, v. t. [imp. & p. p. Lapidified; p. pr.
   & vb. n. Lapidifying.] [Cf. f. lapidifier. See Lapidific,
   and -fy.]
   To convert into stone or stony material; to petrify.
   [1913 Webster]