9 letters · 15 points in Scrabble
noun an electrical device characterized by its capacity to store an electric charge
originFrom capacity + -or. Capacitor replaced the term condenser (coined by Alessandro Volta in 1782) to disambiguate it from steam condenser. The coiner is unknown but the change was recommended in 1926 by British Standard Glossary of Terms in Electrical Engineering.
Etymology from Wiktionary, CC BY-SA 3.0