solenoid

noun

Etymology: From French solénoïde, from Ancient Greek σωληνοειδής (sōlēnoeidḗs) (from σωλήν (sōlḗn, “channel, pipe”) + -ειδής (-eidḗs); see -oid).

1. A coil of wire that acts as a magnet when an electric current flows through it.
2. A coil of wire that acts as a magnet when an electric current flows through it.
3. An electromechanical switch controlled by a solenoid; solenoid switch, relay.
4. The region of intersection between isobaric and isopycnal surfaces.