lignifies

Verb

lignify (third-person singular simple present lignifies, present participle lignifying, simple past and past participle lignified)

1. (intransitive) To become wood.
2. (intransitive) To develop woody tissue as a result of incrustation of lignin during secondary growth.
3. (broadly, intransitive) To become rigid or fixed, like something made of wood.
4. (transitive) To turn into wood; to make ligneous.