cel·lu·loid
noun/ˈseljulɔɪd/
/ˈseljulɔɪd/
[uncountable]- a thin clear plastic material made in sheets, used in the past for cinema film
（旧时摄影用的）胶片，赛璐珞片 - (old-fashioned) used as a way of referring to films
电影
Word Originmid 19th cent.: from cellulose + -oid.