an amorphous, cellulose-like substance which acts as a binder for the cellulose fibers in wood and certain plants and adds strength and stiffness to the cell walls
Origin of ligninlign(i)- + -in
A complex polymer, the chief noncarbohydrate constituent of wood, that binds to cellulose fibers and hardens and strengthens the cell walls of plants.
(usually uncountable, plural lignins)
From Latin lignum