Source : Webster's Revised Unabridged Dictionary (1913)

Injection \In*jec"tion\, n. [L. injectio : cf.F. injection.]
   1. The act of injecting or throwing in; -- applied
      particularly to the forcible throwing in of a liquid, or
      a["e]riform 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. (Anat.)
      (a) The act or process of filling vessels, cavities, or
          tissues with a fluid or other substance.
      (b) A specimen prepared by injection.

   4. (Steam Eng.)
      (a) The act of throwing cold water into a condenser to
          produce a vacuum.
      (b) 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.



   3. (Chem.) An apparatus for receiving and condensing the
      volatile products of distillation to a liquid or solid
      form, by cooling.

   4. (Steam Engine) An apparatus, separate from the cylinder,
      in which the exhaust steam is condensed by the action of
      cold water or air. See Illust. of {Steam engine}.

   {Achromatic condenser} (Optics), an achromatic lens used as a
      condenser.

   {Bull's-eye condenser}, or {Bull's-eye} (Optics), a lens of
      short focal distance used for concentrating rays of light.
      

   {Injection condenser}, a vessel in which steam is condensed
      by the direct contact of water.

   {Surface condenser}, an apparatus for condensing steam,
      especially the exhaust of a steam engine, by bringing it
      into contact with metallic surface cooled by water or air.