A person or thing that regulates something, in particular
A device for controlling the flow of gas, now especially in a gun.
A box-shaped regulator; specifically one which controls the flow of air to an engine, furnace, etc.
= field rheostat.
A gene that controls the expression of one or more other genes; especially one that produces a protein that inhibits the transcription of another gene.
Any of various kinds of regulator that are electrically operated.
A popular movement of protest against widespread lawlessness and official corruption in the Carolinas (chiefly North Carolina) in the late 1760s, developing into an uprising against the colonial government.
= regulatory protein.