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 ]
☞ 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,
Urea ferment,
a. Of or pertaining to urea; containing, or consisting of, urea;
n. [ Urea + -meter. ] (Physiol. Chem.) An apparatus for the determination of the amount of urea in urine, in which the nitrogen evolved by the action of certain reagents, on a given volume of urine, is collected and measured, and the urea calculated accordingly. [ 1913 Webster ]