As a Noun: 1. A round object onto which film can be wound, especially before it is put in a projector. English = spool, reel. 2. A machine that turns a spool of film and projects the film onto a screen or wall. English = projector. 3. A person whose job is to work a projector, for example in a cinema. English = projectionist. As a Verb or Adjective: 1. To operate a projector.