microfiche UK /ˈmaɪ.kɹəʊˌfiːʃ/US /ˈmaɪ.kɹoʊˌfiːʃ/noun 2verb 1forms 3 noun2 •A sheet of microfilm, six by four inches, holding several hundred reduced images of document pages, read using a microfiche reader or microfilm reader. •A device used to magnify and read these sheets. verb1 •To convert (documents) to microfiche format. formsmicrofiched · microfiching · microfiches