a film bearing a miniature photographic copy of printed or other graphic matter, usually of a document, newspaper or book pages, etc., made for a library, archive, or the like.
a film, especially of motion-picture stock, on which microcopies are made.
verb (used with object)
to make a microfilm of.

1930–35; micro- + film

microfilmer, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
microfilm (ˈmaɪkrəʊˌfɪlm)
1.  a strip of film of standard width on which books, newspapers, documents, etc, can be recorded in miniaturized form
2.  to photograph (a page, document, etc) on microfilm

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1927, coined from micro- + film. The verb is first recorded 1940, from the noun.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

microfilm definition

A film on which miniature copies of documents are reproduced. Microfilm allows for very compact storage of books and documents.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Most large libraries have copies, usually on microfilm, of newspapers from
  their regions.
Except that his was a mechanical implementation that used microfilm.
He wanted a way to index the microfilm so you could jump from one microfiche to
  another, and do cross-referencing and such.
And the bulk of the public record is no longer to be found in library stacks,
  dusty courthouse files, and microfilm rolls.
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