Etymology
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celluloid (n.)

transparent plastic made from nitro-celluloses and camphor, 1871, trademark name (reg. U.S.), a hybrid coined by U.S. inventor John Wesley Hyatt (1837-1900) from cellulose + Greek-based suffix -oid.

Its use as a photographic film was noted by 1889.As an adjective, "of or pertaining to motion pictures," by 1922; as a noun, figuratively, "motion pictures" from 1934. Abbreviated form cell "sheet of celluloid" is from 1933 (see cel).

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Definitions of celluloid
1
celluloid (n.)
highly flammable substance made from cellulose nitrate and camphor; used in e.g. motion-picture and X-ray film; its use has decreased with the development of nonflammable thermoplastics;
celluloid (n.)
a medium that disseminates moving pictures;
theater pieces transferred to celluloid
Synonyms: film / cinema
2
celluloid (adj.)
artificial as if portrayed in a film;
a novel with flat celluloid characters
Synonyms: synthetic
From wordnet.princeton.edu