What is "injection cock"

Injection \In*jec"tion\, n. [L. injectio : cf. F. injection.]

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

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

3. (Anat.)

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

   2. A specimen prepared by injection.

4. (Steam Eng.)

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

   2. 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.

      fuel injection, a method of inserting fuel into internal-combustion engines by directly forcing the liquid fuel into the combustion chamber at an appropriate point in the piston cycle; in contrast to carburetion, in which an air-fuel mixture is drawn in by the downward stroke of the piston.