[f. next: see -FICATION.] The process of becoming ligneous.
1808. Good, in Ann. Reg., Char., etc. 112. We can trace the age of a tree with a considerable degree of certainty, by allowing a year for every outer circle, and about two or three years for the complete lignification of the innermost.
1877. Bennett, trans. Thomé’s Bot., 22. The lignification or conversion into cork of cell-walls.
1885. Goodale, Physiol. Bot., 62. Lignification may increase the thickness of the cell-wall.
