Solenoid

Noun

1. A coil of wire that acts as a magnet when an electric current flows through it. An electromechanical device consisting of such a coil containing a metal core, the movement of which is controlled by the current.
2. An electromechanical device consisting of such a coil containing a metal core, the movement of which is controlled by the current.
3. An electromechanical switch controlled by a solenoid; solenoid switch, relay.
4. The region of intersection between isobaric and isopycnal surfaces.