Dictionary![]() ![]() cel•lu•loidPronunciation: (sel'yu-loid"), [key] —n. 1. 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. 2. motion-picture film. —adj. Informal.of or involving motion pictures. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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