The Collaborative International Dictionary of English v.0.48:

Calcify \Cal"ci*fy\ (k[a^]l"s[i^]*f[imac]), v. t. [imp. & p. p.
   Calcified (-f[imac]d); p. pr. & vb. n. Calcifying.] [L.
   calx, calcis, lime + -fy.]
   To make stony or calcareous by the deposit or secretion of
   salts of lime.
   [1913 Webster]