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urea - 6 dictionary results
u⋅re⋅a
[yoo-ree-uh, yoo
r-ee-uh] 
–noun
| 1. | Biochemistry. a compound, CO(NH2)2, occurring in urine and other body fluids as a product of protein metabolism. |
| 2. | 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. |
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Link To urea
| u·re·a (yŏŏ-rē'ə) n. A water-soluble compound, CO(NH2)2, 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. [New Latin, from French urée, from urine, urine, from Old French, from Latin ūrīna; see urine.] |
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Urea
U"re*a\, a. [NL. See Urine.] (Physiol. Chem.) A very soluble crystalline body which is the chief constituent of the urine in mammals and some other animals. It is also present in small quantity in blood, serous fluids, lymph, the liver, etc. Note: It is the main product of the regressive metamorphosis (katabolism) of proteid matter in the body, and is excreted daily to the amount of about 500 grains by a man of average weight. Chemically it is carbamide, CO(NH2)2, and when heated with strong acids or alkalies is decomposed into carbonic acid and ammonia. It unites with acids to form salts, as nitrate of urea, and it can be made synthetically from ammonium cyanate, with which it is isomeric. Urea ferment, a soluble ferment formed by certain bacteria, which, however, yield the ferment from the body of their cells only after they have been killed by alcohol. It causes urea to take up water and decompose into carbonic acid and ammonia. Many different bacteria possess this property, especially Bacterium ure[ae] and Micrococcus ure[ae], which are found abundantly in urines undergoing alkaline fermentation.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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Main Entry: urea
Pronunciation: yu-'rE-&
Function: noun
: a soluble weakly basic nitrogenous compound CH4N2O that is the chiefsolid component of mammalian urine and an end product of protein decomposition and that is administered intravenously as a diuretic drug called also carbamide
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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urea u·re·a (y&oobreve;-rē'ə)
n.
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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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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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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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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