Solenoid

[1] An electrically operated magnetic device used to operate some unit. A movable iron core is placed inside a coil of wire which moves because of magnetic attraction when electric current is fed to the coil. When current flows through the coil, the core will attempt to center itself in the coil. In so doing, the core will exert considerable force on anything it is connected to.
[2] An electromagnetic valve or relay that opens or closes to regulate hydraulic pressure in an anti-lock brake system. See clutch solenoid, fast idle solenoid, idle stop solenoid, starter solenoid, stop solenoid, throttle solenoid, vacuum solenoid