LIGNIFY
lignify
(verb) convert into wood or cause to become woody
Source: WordNet® 3.1
Etymology
Verb
lignify (third-person singular simple present lignifies, present participle lignifying, simple past and past participle lignified)
(intransitive) To become wood.
(intransitive, botany) To develop woody tissue as a result of incrustation of lignin during secondary growth.
(intransitive, by extension) To become rigid or fixed, like something made of wood.
(transitive) To turn into wood; to make ligneous.
Source: Wiktionary
Lig"ni*fy, v. t. [imp. & p. p. Lignified; p. pr. & vb. n.
Lignifying.] Etym: [L. lignum wood + -fy: cf. F. lignifier.] (Bot.)
Definition: To convert into wood or into a ligneous substance.
Lig"ni*fy, v. i. (Bot.)
Definition: To become wood.
Source: Webster’s Unabridged Dictionary 1913 Edition