regulator
nounUK /ˈreɡ.jə.leɪ.tər/
US /ˈreɡ.jə.leɪ.t̬ɚ/
A person or thing that makes sure rules are followed.
The water regulator keeps the pressure safe in the pipes.
OTHER MEANINGS
2. A device that controls how much gas, water, or electricity flows.
He turned the regulator to lower the gas flow.
3. An official group that checks that companies follow the law.
The bank regulator fined the company for breaking rules.
4. A small part inside a clock or watch that keeps it running at the right speed.
The old watch's regulator was broken, so it lost time.