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regulator

reg·u·la·tor [ réggyə làytər ] (plural reg·u·la·tors)


noun 
Definition:
 
1. control mechanism: a mechanism that controls something such as pressure, temperature, speed, or voltage ( often used in combination )

2. controlling official: an official who controls a particular activity and makes certain that regulations are complied with ( often used in combination )
the industry regulator

3. very accurate timepiece: a very accurate watch or clock, used as a standard by which others are set

4. genetics 
Same as  regulator gene


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