lignin

Noun
  1. A complex polymer;
    The chief constituent of wood other than carbohydrates;
    Binds to cellulose fibers to harden and strengthen cell walls of plants (synset 114959457)
    is a type of: polymer - a naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers
    substance meronym: wood - the hard fibrous lignified substance under the bark of trees

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