Source : Webster's Revised Unabridged Dictionary (1913)

Lignify \Lig"ni*fy\ (-f[imac]), v. t. [imp. & p. p. {Lignified}
   (-f[imac]d); p. pr. & vb. n. {Lignifying} (-f[imac]`[i^]ng).]
   [L. lignum wood + -fy: cf. F. lignifier.] (Bot.)
   To convert into wood or into a ligneous substance.

Source : WordNet®

lignified
     adj : made hard like wood as the result of the deposition of
           lignin in the cell walls [syn: {woody}]

lignified
     See {lignify}