Webster's English Dictionary

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urine

urine \'yu.r-*n\ \'yu.r-*-n*s\ n [ME, fr. MF, fr. L urina; akin to Gk ouron 
   urine, ourein to u]rinate, OE wter water : the chief excretory product 
   of the vertebrate being secreted by the kidn ey as liquid or semisolid 
   matter rich in end products of protein metabolism, salts, and pigments and 
   in man forming a clear amber usu. slightly acid fluid - urin.ous aj