from
The Collaborative International Dictionary of English v.0.48
Injector \In*ject"or\, n.
1. One who, or that which, injects.
[1913 Webster]
2. (Mach.) A contrivance for forcing feed water into a steam
boiler by the direct action of the steam upon the water.
The water is driven into the boiler by the impulse of a
jet of the steam which becomes condensed as soon as it
strikes the stream of cold water it impels; -- also called
{Giffard's injector}, from the inventor.
{fuel injector}, a device for actively injecting fuel into an
internal-combustion engines by directly forcing the liquid
fuel into the combustion chamber at an appropriate point
in the piston cycle; -- an alternative to a {carburetor},
in which an air-fuel mixture is drawn in by the downward
stroke of the piston.
[1913 Webster]