1. An official responsible for control and supervision of a particular activity or area of public interest
   "The financial regulator imposed new rules to protect consumers"
    
2. Any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
   "The pressure regulator on the gas tank needed replacement"
    
3. A control that maintains a steady speed in a machine (as by controlling the supply of fuel)
   "The regulator on the engine prevented it from overrevving";
   - governor

Derived forms: regulators

Type of: control, controller, functionary, official

Encyclopedia: Regulator