\Ex*og"e*nous\, a.
1. (Bot.) Pertaining to, or having the character of, an
   exogen; -- the opposite of endogenous.

2. (Biol.) Growing by addition to the exterior.

3. (Anat.) Growing from previously ossified parts; -- opposed
   to {autogenous}. --Owen.

{Exogenous aneurism} (Med.), an aneurism which is produced by
   causes acting from without, as from injury.