Lig′ni‐fi‐ca″tion (lĭg′nĭ‐fĭ‐kā″shŭn), n. [Cf. F. lignification. See Lignify.] (Bot.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.