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Webster's 1828 Dictionary

LIGNIFICATION

n.The process of becoming or of converting into wood, or the hard substance of a vegetable.

 

Webster's 1913 Dictionary

LIGNIFICATION

Lig `ni *fi *ca "tion, n. Etym: [Cf. F. lignification. See Lignify. ](Bot. )

 

Defn: A change in the character of a cell wall, by which it becomes harder. It is supposed to be due to an incrustation of lignin.