a tough, highly flammable substance consisting essentially of cellulose nitrate and camphor, used in the manufacture of motion-picture and x-ray film and other products.
motion-picture film.
Informal. of or involving motion pictures.

former trademark; cellul(ose) + -oid

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World English Dictionary
celluloid (ˈsɛljʊˌlɔɪd)
1.  a flammable thermoplastic material consisting of cellulose nitrate mixed with a plasticizer, usually camphor: used in sheets, rods, and tubes for making a wide range of articles
2.  a.  a cellulose derivative used for coating film
 b.  one of the transparent sheets on which the constituent drawings of an animated film are prepared
 c.  a transparent sheet used as an overlay in artwork
 d.  cinema film

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1871, trademark name (reg. U.S.), coined by U.S. inventor John Wesley Hyatt (1837-1900) from L. cellula dim. of cella (see cell) + -oid, from Gk. -o-eides "a form, shape" (comb. form). Abbreviated form cell "sheet of celluloid" is from 1933.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He came up with a single camera scheme, using a celluloid band of film.
Good as it is in celluloid form, it could have been better if the adapter had essayed a few new ideas in mapping out the script.
Scenes were laboriously captured on celluloid, at great expense.
Back home, he finds he is losing trade to a rival who sells newfangled
  celluloid beads.
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