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c.1600, from Latin iniectus "a casting on, throwing over," past participle of inicere "to throw in or on," from in- "in" (see in- (2)) + -icere, comb. form of iacere "to throw" (see jet (v.)). Related: Injectable; injected; injecting.
inject in·ject (ĭn-jěkt')v. in·ject·ed, in·ject·ing, in·jects
To introduce a substance, such as a drug or vaccine, into a body part.
To treat by means of injection.