sensor
sen‧sor /ˈsensə $ -ər/
noun [countable]
sen‧sor /ˈsensə $ -ər/
noun [countable] Word Family: adjective: sensible, insensible, senseless, sensitive ≠ insensitive, sensory, nonsensical, insensate; noun: sense ≠ nonsense, sensibility ≠ insensibility, sensitivity ≠ insensitivity, senselessness, sensitization, sensor; adverb: sensibly, senselessly, sensitively ≠ insensitively; verb: sense, sensitize
a piece of equipment used for discovering the presence of light, heat, movement etc