verb (used with object)

  1. to force (a fluid) into a passage, cavity, or tissue: to inject a medicine into the veins.
  2. to introduce (something new or different): to inject humor into a situation.
  3. to introduce arbitrarily or inappropriately; intrude.
  4. to interject (a remark, suggestion, etc.), as into conversation.

verb (tr)

  1. med to introduce (a fluid) into (the body of a person or animal) by means of a syringe or similar instrument
  2. (foll by into) to introduce (a new aspect or element)to inject humour into a scene
  3. to interject (a comment, idea, etc)
  4. to place (a rocket, satellite, etc) in orbit

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.


  1. Of or relating to a substance introduced into the body.
  2. Of or relating to a blood vessel that is visibly distended with blood.


  1. To introduce a substance, such as a drug or vaccine, into a body part.
  2. To treat by means of injection.

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