GNU Collaborative International Dictionary of English

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1.       
   Injection , n. [L. injectio : cf. F. injection.]
    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.
   1913 Webster
   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.
   
   1913 Webster
   (Anat.) (a) The act or process of filling vessels, cavities, or tissues with a fluid or other substance. (b) A specimen prepared by injection.
   1913 Webster
   (Steam Eng.) (a) The act of throwing cold water into a condenser to produce a vacuum. (b) The cold water thrown into a condenser.
   1913 Webster
   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.
   1913 Webster
   +PJC