Etymology
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lignin (n.)

organic substance forming the basis of wood-cells, 1821, from Latin lignum "wood" (see ligni-) + chemical suffix -in (2).

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Definitions of lignin

lignin (n.)
a complex polymer; the chief constituent of wood other than carbohydrates; binds to cellulose fibers to harden and strengthen cell walls of plants;
From wordnet.princeton.edu