different between celluloid vs celloidin

English

Former trademark of Celluloid Manufacturing Company

celluloid (countable and uncountable, plural celluloids)

Any of a variety of thermoplastics created from nitrocellulose and camphor, once used as photographic film.
- 1894 June, Antonia Dickson, W. K. L. Dickson, Edison's Invention of the Kineto-Phonograph: Account of the Invention, article in Century Magazine, Volume 48, Issue 2,
  Then followed some experiments with drums, over which sheets of sensitized celluloid film were drawn, the edges being pressed into a narrow slot in the surface, similar in construction to the old tin-foil phonograph.
- 1910, Stephen Leacock, The Conjurer's Revenge, in Literary Lapses,
  "And will you now, sir, take off your celluloid collar and permit me to burn it in the candle? Thank you, sir. And will you allow me to smash your spectacles for you with my hammer? Thank you."
(figuratively, often used attributively) The genre of cinema; film.
- 2001 August 14, Riki Wilchins, Gender on celluloid, in The Advocate, page 26.
(obsolete) An item, such as a jacket, made from celluloid.

From cellulose + -oid + -in

celloidin (plural celloidins)

(biology) A semisolid solution of pyroxylin in ether and alcohol. Used to embed specimens for microscopy before they are sectioned and placed on slides.
A specimen embedded in celloidin.

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