'Injector' definitions:

Definition of 'injector'

From: WordNet
noun
A contrivance for injecting (e.g., water into the boiler of a steam engine or particles into an accelerator etc.)

Definition of 'Injector'

From: GCIDE
  • 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]