7 letters · 9 points in Scrabble
noun an electrical device used to introduce reactance into a circuit
noun (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements
originEtymology tree English react Proto-Indo-European *-tōr Proto-Italic *-tōr Latin -tor Latin -ātor Old French -eorbor. Middle English -our ▲ Latin -torlbor. English -or English reactor From react + -or.
Etymology from Wiktionary, CC BY-SA 3.0