sensor
noun
- device to detect or measure a physical quantity
Wiktionary
Pronunciation: /ˈsɛn.sə/ / /ˈsɛn.sɚ/
noun
Etymology: Originated 1925–30, formed as a Latin loanword from sentiō (“to feel”) + -tor (“-er”). By surface analysis, sense + -or.
- A device or organ that detects certain external stimuli and responds in a distinctive manner.
“The smoke sensor triggered the alarm.”
“Modern phones contain a light sensor that adjusts brightness.”