injector

American  

[in-jek-ter] / ɪnˈdʒɛk tər /

noun

1. a person or thing that injects.

2. Machinery.

   1. a device for injecting feedwater into a boiler against high pressure by means of a jet of steam.

   2. Also called fuel injector.  a mechanism consisting of a pump, valves, and nozzles for spraying fuel into the cylinders of an internal-combustion engine.

---

injector British  

/ ɪnˈdʒɛktə /

noun

1. a person or thing that injects

2. a device for spraying fuel into the combustion chamber of an internal-combustion engine

3. Also: inspirator.  a device for forcing water into a steam boiler

---

Etymology

Origin of injector

First recorded in 1735–45; inject + -or ²

Example Sentences

There was a company called Mylan, which was best known for buying EpiPen, the lifesaving injector for severe allergic reactions, especially for kids, and then multiplying the price sevenfold in under a decade.

From Barron's • Apr. 10, 2026

Patients prescribed Wegovy will be able to self-administer the drug at home using a special pen injector device.

From BBC • Mar. 31, 2026

Thanks to the development of an MRI-compatible microrobot injector, the scientists were able to assemble "particle trains," aggregates of magnetizable microrobots.

From Science Daily • Feb. 14, 2024

Amneal Pharmaceuticals withdrew patents on its epinephrine injector.

From Salon • Feb. 2, 2024

The empty injector buzzed, whirred and retreated into a panel on Festus’s neck.

From "Blood of Olympus" by Rick Riordan