What does "lignin" mean?

A complex non-carbohydrate aromatic polymer present in all wood.

Lignin

Common synonyms include: acrylic, natural polymer from wood, phenolic polymer, plant polymer, plastic, polyphenolic polymer.

/ˈlɪɡ.nɪn/ noun

noun ·Rare ·Advanced level

Noun

1
A complex non-carbohydrate aromatic polymer present in all wood. uncountable, usually
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

From Latin lignum (“wood”) + -in.