sen ‧ sor /ˈsensə $ -ər/ BrE AmE 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 ]
[ Date: 1900-2000 ; Language: Latin ; Origin: sensus , past participle of sentire ; ⇨ ↑ sense 1 ]
a piece of equipment used for discovering the presence of light, heat, movement etc