Webster's English Dictionary

Enter the word to look up:

excretion

ex.cre.tion \ek-'skre--sh*n\ n 1: the act or process of excreting  2: 
   something excreted; esp : useless, superfluous, or harmful mater ial (as 
   urea) eliminated from the body that differs from a secretion in not being 
   reduced to perform a useful function