From The Collaborative International Dictionary of English v.0.44 [gcide]:
Lignin \Lig"nin\ (l[i^]g"n[i^]n), noun [L. lignum wood: cf. F. lignine.] (Bot.) A substance characterizing wood cells and differing from cellulose in its conduct with certain chemical reagents.
Note: Recent authors have distinguished four forms of this substance, naming them lignose, lignin, lignone, and lignireose.
From WordNet (r) 2.0 [wn]:
noun
1: a complex polymer; the chief non-carbohydrate constituent of wood; binds to cellulose fibers to harden and strengthen cell walls of plants
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