regulator

1. (noun) any of various mechanisms or devices for regulating or controlling fluid flow, pressure, temperature, etc.
Related Words: aperture, ball cock, ballcock, control, controller, draft, escape, escape cock, escape valve, faucet, floodgate, flywheel, head gate, peg, penstock, petcock, register, relief valve, safety valve, sluice valve, sluicegate, thermoregulator, thermostat, water gate

2. (noun) a official responsible for control and supervision of a particular activity or area of public interest
Related Words: functionary, official

3. (noun) a control device that maintains a steady speed in a machine (as by controlling the supply of fuel)
Synonyms: governor
Related Words: control, controller, timer



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