exogenous \ex*og"e*nous\, a.
   1. (Bot.) derived from or originating outside; pertaining to,
      or having the character of, an exogen; -- the opposite of
      {endogenous}.

   Syn: exogenetic.
        
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   2. (Bot.) Growing by addition to the exterior; growing by
      addition of a new external layer of cells on the surface
      just beneath the bark; -- of plants.
      
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   3. (Anat.) Growing from previously ossified parts; -- opposed
      to {autogenous}. --Owen.
      
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   4. (Med.) caused by factors from outside the body, rather
      than from an abnormality of internal functions; -- of
      illness.
      [PJC]

   5. (Biol., Biochem.) not synthesized within the organism;
      absorbed or assimilated from outside the organism.
      [PJC]

   {Exogenous aneurism} (Med.), an aneurism which is produced by
      causes acting from without, as from injury.
      
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exogenous
     adj : derived or originating externally [syn: {exogenic}] [ant: {endogenous},
            {endogenous}]