Injector (noun)

A device used to introduce a substance into the body, especially a needle and syringe used for injecting medicine or drugs.

Origin:

Late 19th century: from latin inject- "thrown in", from the verb injicere, from in- "into" + jacere "to throw".

Examples:

1. The nurse used an injector to administer the vaccine.
2. The doctor prescribed an injector for his patient's pain.
3. The injector was used to deliver the medication into the patient's bloodstream.
4. The injector was an essential tool in the hospital.
5. The injector was carefully sterilized before each use.