Cel"lu*loid` (s&ebreve;l"&usl;*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.

• Any of a variety of thermoplastics created from nitrocellulose and camphor, once used as photographic film.