Real Dictionary

microfilm
variable noun: Microfilm is film that is used for photographing information and storing it in a reduced form.

microfilm in American English
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
to photograph on microfilm
noun: 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
transitive verb: to make a microfilm of

microfilm in British English
noun: a strip of film of standard width on which books, newspapers, documents, etc, can be recorded in miniaturized form
verb: to photograph (a page, document, etc) on microfilm