Pronunciation: (in-jek'tur),[key] —n. 1. a person or thing that injects.
2. Mach. a. a device for injecting feedwater into a boiler against high pressure by means of a jet of steam.
b. Also called fuel injector. a mechanism consisting of a pump, valves, and nozzles for spraying fuel into the cylinders of an internal-combustion engine.