Etymology
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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.

updated on January 10, 2019

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Definitions of microfilm from WordNet
1
microfilm (v.)
record on microfilm;
2
microfilm (n.)
film on which materials are photographed at greatly reduced size; useful for storage; a magnification system is used to read the material;
From wordnet.princeton.edu, not affiliated with etymonline.