microfilm
n.
1927, coined from micro- + film, n.. The verb is first recorded 1940, from the noun. Related: Microfilmed; microfilming.
〔李〕[micro-=very small 微小的；film n.胶卷⇒“film for very small photographs 拍摄微小照片的胶卷”→] n. film for making printed matters into very smll photographs 缩微胶卷