"regulator" in the noun sense
1. regulator
any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
2. regulator
an official responsible for control and supervision of a particular activity or area of public interest
3. governor, regulator
a control that maintains a steady speed in a machine (as by controlling the supply of fuel)
Source: WordNet® (An amazing lexical database of English)
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