Definify.com
Webster 1913 Edition
Lignin
Lig′nin
(lĭg′nĭn)
, Noun.
[L.
lignum
wood: cf. F. lignine
.] (Bot.)
A substance characterizing wood cells and differing from cellulose in its conduct with certain chemical reagents.
☞ Recent authors have distinguished four forms of this substance, naming them lignose, lignin, lignone, and lignireose.