Lignin n. (Bot.) A substance characterizing wood cells and differing from cellulose in its conduct with certain chemical reagents. Note: Recent authors have distinguished four forms of this substance, naming them lignose, lignin, lignone, and lignireose.
... hemicelluloses, celluloses, and the constituents of lignin without essential change, the substance, after being freed from fat, is extracted with dilute hydrochloric acid and ammonia, and the residue frequently agitated for a day or two with 5-6 p.ct. caustic soda ... — Researches on Cellulose - 1895-1900 • C. F. Cross
...
