An injection is a shot, or a dose of medicine given by way of a syringe and a needle. When you get jabbed in the arm with a tetanus vaccine, that's an injection.

The medical kind of injection forces a small amount of a drug under the skin or directly into a muscle. Other injections are similar in that they involve a liquid being forced by pressure, like the fuel injection in a car, which pushes gasoline directly into the engine. Since the 1600s, injection has been used to mean "forcing a fluid into a body," from the Latin inicere, "to throw in" or "to throw on."

Definitions of injection

n the forceful insertion of a substance under pressure

epidural injection
injection of an anesthetic substance into the epidural space of the spinal cord in order to produce epidural anesthesia
Type of:
insertion, introduction, intromission
the act of putting one thing into another

n the act of putting a liquid into the body by means of a syringe

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intradermal injection
an injection into the skin
intramuscular injection
an injection into a muscle
intravenous injection
an injection into a vein
subcutaneous injection
an injection under the skin
something craved, especially an intravenous injection of a narcotic drug
Type of:
medical aid, medical care
professional treatment for illness or injury

n any solution that is injected (as into the skin)

Type of:
a homogeneous mixture of two or more substances; frequently (but not necessarily) a liquid solution

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