The Collaborative International Dictionary
Lignification
Lignification \Lig`ni*fi*ca"tion\ (l[i^]g`n[i^]*f[i^]*k[=a]"sh[u^]n), 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.
Wiktionary
lignification
n. Turning to wood; the process of becoming ligneous.
Usage examples of "lignification".
He saw their proportions, the distances between the single parts, the degree of lignification, the intensity of colour, etc.