[yoo-ree-uh, yoor-ee-uh]
Biochemistry. a compound, CO(NH 2 ) 2 , occurring in urine and other body fluids as a product of protein metabolism.
Chemistry. a water-soluble powder form of this compound, obtained by the reaction of liquid ammonia and liquid carbon dioxide: used as a fertilizer, animal feed, in the synthesis of plastics, resins, and barbiturates, and in medicine as a diuretic and in the diagnosis of kidney function.
Also called carbamide.

1800–10; < Neo-Latin < French urée; ultimately < Greek oûron urine or oureîn to urinate; see uro-1

ureal, ureic, adjective
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World English Dictionary
urea (ˈjʊərɪə)
Also called: carbamide a white water-soluble crystalline compound with a saline taste and often an odour of ammonia, produced by protein metabolism and excreted in urine. A synthetic form is used as a fertilizer, animal feed, and in the manufacture of synthetic resins. Formula: CO(NH2)2
[C19: from New Latin, from French urée, from Greek ouronurine]

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American Heritage
Medical Dictionary

urea u·re·a (yu-rē'ə)
A water-soluble compound that is the major nitrogenous end product of protein metabolism and is the chief nitrogenous component of the urine in mammals and other organisms. Also called carbamide.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
urea   (y-rē'ə)  Pronunciation Key 
The chief nitrogen-containing waste product excreted in the urine of mammals and some fish. It is the final nitrogenous product in the breakdown of proteins by the body, during which amino groups (NH2) are removed from amino acids and converted into ammonium ions (NH4), which are toxic at high concentrations. The liver then converts the ammonium ions into urea. Urea is also made artificially for use in fertilizers and medicine. Chemical formula: CON2H4.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The water in the frog's cells freezes and is replaced with glucose and urea to
  keep cells from collapsing.
Surprisingly, no mention of urea, the major nitrogen- containing component of
They secrete the blood protein albumin, synthesize urea, and make the enzymes
  necessary to break down drugs and toxins.
Debridement can help, and there has been some research into a urea paste that
  is encouraging.
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