Etymology
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Ziegfeld 
in reference to showgirls or stage revues, 1913, from Florenz Ziegfeld (1869-1932), U.S. theatrical producer, who staged annual "follies" from 1907-1931.
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microfilm (n.)

"photographic film containing microphotographs of the pages of a book, etc.," 1927, coined from micro- + film (n.). The verb is by 1940, from the noun. Related: Microfilmed; microfilming.

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projectionist (n.)

"one who operates a film projector," 1916, from projection + -ist.

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Ice-Capade (n.)
1941, originally a film title, from ice (n.) + a punning play on escapade.
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screenwriter (n.)

"writer of film scripts," 1921, from screen (n.) in the cinema sense + writer.

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pyrogen (n.)

1858, as a proposed word for "electricity considered as a material substance possessing weight," from pyro- + -gen. Meaning "fever-producer, substance which, introduced into the blood, induces fever" is from 1896. Related: Pyrogenic. Greek pyrogenes meant "born in fire, wrought by fire" (compare pyrogenesis).

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glycogen (n.)
starch-like substance found in the liver and animal tissue, 1860, from French glycogène, "sugar-producer," from Greek-derived glyco- "sweet" (see glyco-) + French -gène (see -gen). Coined in 1848 by French physiologist Claude Bernard (1813-1878).
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undeveloped (adj.)
1736, from un- (1) "not" + past participle of develop (v.). In reference to film, it is attested from 1939.
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preview (n.)

"a foretaste," 1880, from preview (v.); specifically "a showing of a book, film, etc. before public release" by 1920.

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