| urceolus | Origin: L, a little pitcher. <botany> Any urn-shaped organ of a plant. Source: Websters Dictionary (01 Mar 1998) |
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| urchin | 1. <zoology> A hedgehog. 2. <zoology> A sea urchin. See Sea urchin. 3. A mischievous elf supposed sometimes to take the form a hedgehog. "We 'll dress [them] like urchins, ouphes, and fairies." 4. A pert or roguish child; now commonly used only of a boy. "And the urchins that stand with their thievish eyes Forever on watch ran off each with a prize." (W. Howitt) "You did indeed dissemble, you urchin you; but where's the girl that won't dissemble for an husband?" (Goldsmith) 5. One of a pair in a series of small card cylinders, arranged around a carding drum; so called from its fancied resemblance to the hedgehog. <zoology> Urchin fish, a diodon. Origin: OE. Urchon, irchon, a hedgehog, OF. Irecon, ericon, herion, herichon, F. Herisson, a derivative fr. L. Ericius, from er a hedgehog, for her; akin to Gr. Cf. Herisson. Source: Websters Dictionary (01 Mar 1998) |
| urchon | <zoology> The urchin, or hedgehog. Source: Websters Dictionary (01 Mar 1998) |
| Urd | <abbreviation> Uridine. (05 Mar 2000) |
| ure | 1. <zoology> The urus. 2. <prefix> Relating to urea or to urine. Origin: G. Ouron, urine Source: Websters Dictionary (01 Mar 1998) |
| urea | <biochemistry> The final nitrogenous excretion product of many organisms. (18 Nov 1997) |
| urea breath test | A test for the presence of the bacteria helicobacter pylori that causes inflammation and ulcers in the stomach. The breath test is based on the ability of h. Pylori to break down urea. Ten minutes after swallowing a capsule containing urea with labelled carbon, a breath sample is collected to detect labelled carbon in the exhaled breath. A positive test indicates active infection. The test turns negative after eradication of the bacteria from the stomach with antibiotics. (12 Dec 1998) |
| urea clearance | The volume of plasma (or blood) that would be completely cleared of urea by one minute's excretion of urine; originally calculated as urine flow multiplied by urine urea concentration divided by concentration of urea in whole blood rather than plasma, representing blood urea clearance rather than plasma urea clearance. (05 Mar 2000) |
| urea clearance test | A test of renal function based on urea clearance. (05 Mar 2000) |
| urea cycle | The metabolic pathway isfound in vertebrates and takes place in theliver, in it, urea is synthesised from amino acids and carbon dioxide. (09 Oct 1997) |
| urea peroxide | CH4N2O-H2O2;a white crystalline compound used in an aqueous solution as an oxidizing mouthwash. (05 Mar 2000) |
| urea stibamine | A urea derivative of stibanilic acid, used in the treatment of kala azar and certain other tropical diseases. (05 Mar 2000) |
| ureagenesis | Formation of urea, usually referring to the metabolism of amino acids to urea. Synonym: ureapoiesis. Origin: urea + G. Genesis, production (05 Mar 2000) |
| ureal | Relating to or containing urea. Synonym: ureic. (05 Mar 2000) |
| ureameter | <physiology> 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. Origin: Urea. Source: Websters Dictionary (01 Mar 1998) |