8 letters · 9 points in Scrabble
noun a coil of wire around an iron core; becomes a magnet when current passes through the coil
originFrom French solénoïde, from Ancient Greek σωληνοειδής (sōlēnoeidḗs) (from σωλήν (sōlḗn, “channel, pipe”) + -ειδής (-eidḗs); see -oid).
Etymology from Wiktionary, CC BY-SA 3.0