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. [1913 Webster]

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. [1913 Webster]

{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. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • Urea — Urea …   Wikipedia

  • Urea — Urea …   Wikipedia Español

  • urea — f. bioquím. Compuesto que se sintetiza en el hígado y se elimina principalmente por el riñón y que corresponde con el producto final de la degradación de las proteínas. La presencia de urea en la sangre aumenta en los casos de insuficiencia renal …   Diccionario médico

  • urea — ‘Sustancia contenida en la orina’: «Las pacientes pueden presentar ascenso de la urea y densidad urinaria baja» (Rausch/Bay Anorexia [Arg. 1990]). Es voz llana: [uréa]; no es correcta la forma esdrújula ⊕ úrea …   Diccionario panhispánico de dudas

  • Urea — die; <aus nlat. urea, dies aus gr. oũron »Harn«> Harnstoff (Med.) …   Das große Fremdwörterbuch

  • urea — urèa ž DEFINICIJA kem. bijela kristalna, u vodi lako topljiva tvar CO (NH2), nalazi se u tjelesnim tekućinama i osobito u urinu (čovjeka i drugih sisavaca), upotrebljava se kao umjetno gnojivo i u proizvodnji sintetskih smola; karbamid,… …   Hrvatski jezični portal

  • Urea — Urea, so v.w. Harnstoff …   Pierer's Universal-Lexikon

  • Urēa — (v. griech. urein, harnen), der Harnstoff …   Meyers Großes Konversations-Lexikon

  • urèa — ž biol. tvar koja se nalazi u tjelesnim tekućinama, osobito u urinu ✧ {{001f}}grč …   Veliki rječnik hrvatskoga jezika

  • urea — 1806, Latinized from Fr. urée (1803), from Gk. ouron urine (see URINE (Cf. urine)) …   Etymology dictionary