Celluloid \Cel"lu*loid`\ (s[e^]l"[-u]*loid), n. [Cellulose + -oid.]

A substance composed essentially of gun cotton and camphor, and when pure resembling ivory in texture and color, but variously colored to imitate coral, tortoise shell, amber, malachite, etc. It is used in the manufacture of jewelry and many small articles, as combs, brushes, collars, and cuffs; -- originally called xylonite.

Source: Webster's Revised Unabridged Dictionary (1913)