Webster's English Dictionary

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exogenous

ex.og.e.nous \ek-'sa:j-*-n*s\ aj [F exoge'ne exogenous, fr. exo- + -ge'ne 
   (fr. Gk -geneB-s born) - more at -GEN : originating from or due to external 
   causes : as  : growing from or on the outside {~ spores}  of disease  : 
   having a cause external to the body  : of, relating to, or produced by the 
   metabolism of nitrogenous substanc es obtained from food - ex.og.e.nous.ly 
   av