u·re·a (yo?o-r???)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 certain other animals. Also called carbamide.[New Latin, from French urée, from urine, urine, from Old French, from Latin ?r?na; see urine.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.urea (?j??r??) n (Biochemistry) 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. Also called: carbamide [C19: from New Latin, from French urée, from Greek ouron urine] u?real, u?reic adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014u?re?a (y??ri ?, ?y??r i ?) n. 1. a compound, CO(NH2)2, occurring in urine and other body fluids as a product of protein metabolism. 2. a water-soluble powder form of this compound, used as a fertilizer, animal feed, in the synthesis of plastics, resins, and barbiturates, and in medicine as a diuretic. [1800?10;