Hypertext Webster Gateway: "lignin"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Lignin \Lig"nin\ (l[i^]g"n[i^]n), n. [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) 1.7 (wn)
lignin
n : 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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