Sensor

//ˈsɛn.sɚ// noun

Definitions

Noun
  1. 1
    A device or organ that detects certain external stimuli and responds in a distinctive manner.

    "The smoke sensor triggered the alarm."

  2. 2
    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 wordnet

Etymology

Originated 1925–30, formed as a Latin loanword from sentiō (“to feel”) + -tor (“-er”). By surface analysis, sense + -or.

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