definition of
celluloid

[1] #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. wn

[2] #2 celluloid n. [film, cinema] a medium that disseminates moving pictures; "theater pieces transferred to celluloid"; "this story would be good cinema"; "film coverage of sporting events". wn