Interesting discrepancy in that set of definitions. As a noun the throttle is limited to being a valve or the lever controlling a valve, but as a verb it means to regulate the flow of fuel, regardless of whether you’re regulating it with a valve or by changing the output of a pump. So you could throttle an engine without using a throttle!?throt·tle (thrŏtl)
Share:n.
1. A valve that regulates the flow of a fluid, such as the valve in an internal-combustion engine that controls the amount of air-fuel mixture entering the cylinders.
2. A lever or pedal controlling such a valve.
tr.v. throt·tled, throt·tling, throt·tles
1.
a. To regulate the flow of (fuel) in an engine.
b. To regulate the speed of (an engine) with a throttle.
2. To suppress: tried to throttle the press.
3. To strangle (a person); choke.