[n] a control that maintains a steady speed in a machine (as by controlling the supply of fuel) [n] the head of a state government
regulator
abba, administrator, aegis, agent, air warden, arm guard, attendant, backstop, beg, beglerbeg, bey, buffer, bull, bulwark, bumper, burgrave, captain, caretaker, castellan, chatelain, chatelaine, collector, commandant, commander, conductor, conservator, co