A device that controls or limits something.
The voltage regulator stopped working and the resulting overload destroyed the device.
A person or group that sets standards of practice, especially those established by law.
A very accurate clock, used by clockmakers to measure the timekeeping of each newly made clock.
A gene involved in controlling the expression of one or more other genes.
A device that controls the supply of steam to the cylinders of a steam locomotive.
A bulldozer (member of intimidating group of white US Southerners).