ar·ma·ture / ˈärməchər; -ˌchoŏr/ • n. 1. the rotating coil or coils of a dynamo or electric motor. ∎ any moving part of an electrical machine in which a voltage is induced by a magnetic field. ∎ a piece of iron or other object acting as a keeper for a magnet.2. a metal framework on which a sculpture is molded with clay or similar material.3. Biol. the protective covering of an animal or plant. ∎ archaic armor.