Lignin

//ˈlɪɡ.nɪn// noun

Definitions

Noun
  1. 1
    A complex non-carbohydrate aromatic polymer present in all wood. uncountable, usually
  2. 2
    a complex polymer; the chief constituent of wood other than carbohydrates; binds to cellulose fibers to harden and strengthen cell walls of plants wordnet

Etymology

From Latin lignum (“wood”) + -in.

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