Injection

Part of speech: noun (n.)

1. The act of injecting or throwing in; -- applied particularly to the forcible throwing in of a liquid, or aëriform body, by means of a syringe, pump, etc.

2. That which is injected; especially, a liquid medicine thrown into a cavity of the body by a syringe or pipe; a clyster; an enema. Mayne.

3. The act or process of filling vessels, cavities, or tissues with a fluid or other substance.

4. A specimen prepared by injection.

5. The act of throwing cold water into a condenser to produce a vacuum.

6. The cold water thrown into a condenser. Injection cock, or Injection valve (Steam Eng.), the cock or valve through which cold water is admitted into a condenser. -- Injection condenser. See under Condenser. -- Injection pipe, the pipe through which cold water is through into the condenser of a steam engine.