Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun One that regulates, as.
  • noun The mechanism in a watch by which its speed is governed.
  • noun A highly accurate clock used as a standard for timing other clocks.
  • noun A device used to maintain uniform speed in a machine; a governor.
  • noun A device used to control the flow of gases, liquids, or electric current.
  • noun One, such as the member of a governmental regulatory agency, that ensures compliance with laws, regulations, and established rules.
  • noun A substance that affects the amount of product or the progress of a biochemical reaction or process.

from The Century Dictionary.

  • noun One who or that which regulates.
  • noun A mechanical contrivance intended to produce uniformity of motion, temperature, power, etc.
  • noun The original valve-motion of Watt's double-action condensing pumping-engine. It was a valve-box having a spindle through one of its sides, on which was a toothed sector working on a central bearing, and meshing with a rack attached to a valve. A tripping-lever attached to the sector and operated by the plug-tree caused the oscillations of the latter to open and close the valve.

from the GNU version of the Collaborative International Dictionary of English.

  • noun One who, or that which, regulates.
  • noun (Mach.) A contrivance for regulating and controlling motion.
  • noun The lever or index in a watch, which controls the effective length of the hairspring, and thus regulates the vibrations of the balance.
  • noun The governor of a steam engine.
  • noun A valve for controlling the admission of steam to the steam chest, in a locomotive.
  • noun A clock, or other timepiece, used as a standard of correct time. See Astronomical clock (a), under Clock.
  • noun U.S. A member of a volunteer committee which, in default of the lawful authority, undertakes to preserve order and prevent crimes; also, sometimes, one of a band organized for the comission of violent crimes.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A device that controls or limits something.
  • noun A person or group that sets standards of practice, especially those established by law.
  • noun A very accurate clock, used by clockmakers to measure the timekeeping of each newly made clock.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
  • noun a control that maintains a steady speed in a machine (as by controlling the supply of fuel)
  • noun an official responsible for control and supervision of a particular activity or area of public interest

Etymologies

Sorry, no etymologies found.

Examples

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