microfilm
noun [ C or U ]
uk/ˈmaɪkrəʊˌfɪlm/ usfilm on which photographs of documents are stored in a very small form, or a piece of this film:
Most libraries have old newspapers available on microfilm.
microfilm
verb [ T ]
uk/ˈmaɪkrəʊˌfɪlm/ usto take a photograph of something using microfilm