say it: di-TEK-tur
detector is a noun meaning "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". It carries 3 recorded senses.
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
rectifier that extracts modulation from a radio carrier wave
electronic equipment that detects the presence of radio signals or radioactivity
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for detector come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.