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regulator (n.)

1650s, "one who regulates" in any sense, agent noun in Latin form from regulate. In English history from 1680s; in American history from 1767, applied to local posses that kept order (or disturbed it) in rural regions. From 1702 as "device for controlling machinery in motion;" the specific sense of "mechanical device or clock used to set the time of other pieces" is from 1758.

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Definitions of regulator from WordNet

regulator (n.)
any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.;
regulator (n.)
an official responsible for control and supervision of a particular activity or area of public interest;
regulator (n.)
a control that maintains a steady speed in a machine (as by controlling the supply of fuel);
Synonyms: governor
From wordnet.princeton.edu