Source : Webster's Revised Unabridged Dictionary (1913)

Ossify \Os"si*fy\, v. t. [imp. & p. p. {Ossified}; p. pr. & vb.
   n. {Ossifying}.] [L. os, ossis, bone + -fy: cf. F. ossifier.
   See {Osseous}.]
   1. (Physiol.) To form into bone; to change from a soft animal
      substance into bone, as by the deposition of lime salts.

   2. Fig.: To harden; as, to ossify the heart. --Ruskin.

Ossifying \Os"si*fy`ing\, a. (Physiol.)
   Changing into bone; becoming bone; as, the ossifying process.