reg ‧ u ‧ la ‧ tor AC /ˈreɡjəleɪtə, ˈreɡjʊleɪtə $ -ər/ BrE AmE noun [countable]
[ Word Family: noun : ↑ regulation , ↑ regulator ; verb : ↑ regulate ; adjective : ↑ regulatory ]
1 . an instrument for controlling the temperature, speed etc of something:
a heat regulator
2 . someone who makes sure that a system operates properly or fairly:
traffic safety regulators