lignin

A complex polymer, the chief noncarbohydrate constituent of wood, that binds to cellulose fibers and hardens and strengthens the cell walls of plants.

An organic substance which forms the characteristic part of wood-cells, bast-cells, and all woody fibers, making the greater part of the weight of most dry wood.

A substance characterizing wood cells and differing from cellulose in its conduct with certain chemical reagents.

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

a complex polymer; the chief constituent of wood other than carbohydrates; binds to cellulose fibers to harden and strengthen cell walls of plants