Etymology
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injector (n.)

1727, agent noun from inject (v.).

updated on December 13, 2015

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Definitions of injector from WordNet

injector (n.)
a contrivance for injecting (e.g., water into the boiler of a steam engine or particles into an accelerator etc.);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.