D defs.my
Entry 2 senses Webster, 1913

Injector

/ĭnˌ-jĕk'-tẽr/ · In·ject·or · IPA /ɪnˈd͡ʒɛktɚ/
01 n. One who, or that which, injects.
  1. 1.
    One who, or that which, injects.
  2. 2.
    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.(Mach.) Also: Giffard's injector
Phrases & compounds
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.