8 letters · 11 points in Scrabble
noun any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner
noun rectifier that extracts modulation from a radio carrier wave
noun electronic equipment that detects the presence of radio signals or radioactivity
originBorrowed from Latin dētēctor. Equals detect + -or (agent noun forming suffix).
Etymology from Wiktionary, CC BY-SA 3.0