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 ureæ and Micrococcus ureæ, which are found abundantly in urines undergoing alkaline fermentation.

(U"re*al) a. Of or pertaining to urea; containing, or consisting of, urea; as, ureal deposits.

(U`re*am"e*ter) 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.

(U`re*chi"tin) n. (Chem.) A glucoside extracted from the leaves of a certain plant (Urechitis suberecta) as a bitter white crystalline substance.

(U`re*chi*tox"in) n. [Urechitin + toxic + -in.] (Chem.) A poisonous glucoside found accompanying urechitin, and extracted as a bitter white crystalline substance.

(||U*re"do) n. [L., a blast, blight, a burning itch, fr. urere to burn, to scorch.]

1. (Bot.) One of the stages in the life history of certain rusts regarded at one time as a distinct genus. It is a summer stage preceding the teleutospore, or winter stage. See Uredinales, in the Supplement.

2. (Med.) Nettle rash. See Urticaria.

(U*re"do*spore) n. (Bot.) The thin-walled summer spore which is produced during the so- called Uredo stage of certain rusts. See (in the Supplement) Uredinales, Heterœcious, etc.

(U"re*ide) n. (Chem.) Any one of the many complex derivatives of urea; thus, hydantoin, and, in an extended dense, guanidine, caffeine, et., are ureides. [Written also ureid.]

- uret
(-u*ret) A suffix with the same meaning as -ide. See -ide. [Obs.]

Urchon to Urohyal

(Ur"chon) n. (Zoöl.) The urchin, or hedgehog.

(Ur"du) n. [Hind. urdu.] The language more generally called Hindustanee.

(Ure) n. [OE. ure, OF. oevre, ovre, ouvre, work, F. œuvre, L. opera. See Opera, Operate, and cf. Inure, Manure.] Use; practice; exercise. [Obs.] Fuller.

Let us be sure of this, to put the best in ure
That lies in us.

(Ure), v. t. To use; to exercise; to inure; to accustom by practice. [Obs.]

The French soldiers . . . from their youth have been practiced and ured in feats of arms.
Sir T. More.

(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.

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.

  By PanEris using Melati.

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