cel ‧ lu ‧ loid /ˈseljəlɔɪd, ˈseljʊlɔɪd/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Origin: Celluloid , a trademark ]
1 . on celluloid on cinema film:
Chaplin’s comic genius is preserved on celluloid.
2 . a plastic substance made mainly from ↑ cellulose that was used in the past to make photographic film and other objects