Webster's English Dictionary

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excrete

ex.crete \ek-'skre-t\ vt [L excretus, pp. of excernere to sift out, 
   discharge, fr. ex-] + cernere to sift - more at CERTAIN : to separate and 
   eliminate or discharge from the blood or tissues or fro m the active 
   protoplasm - ex.cret.er n