film on which documents, printed pages, etc. are photographed in a reduced size for convenience in storage and transportation: enlarged prints can be made from such film, or the film can be viewed by projection
reproduction on microfilm
transitive verb, intransitive verb
to photograph on microfilm
See microfilm in American Heritage Dictionary 4
(mīˈkrə-fĭlmˌ)
noun
A film on which printed materials are photographed at greatly reduced size for ease of storage.