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up·wind adverb or adjective : in the direction from which the wind is blowing

ura·cil noun : a pyrimidine base that is one of the four bases coding genetic information in the molecular chain of RNA

ura·ni·um noun : a silvery heavy radioactive metallic chemical element used as a source of atomic energy

Ura·nus noun [ORIGIN: LL, the sky personified as a god, fr. Gk Ouranos, fr. ouranos sky, heaven]

: the planet 7th in order from the sun

ur·ban adjective : of, relating to, characteristic of, or constituting a city

ur·bane adjective [ORIGIN: L urbanus urban, urbane, fr. urbs city]

: very polite and polished in manner : SUAVE

Synonyms

debonair, smooth, sophisticated, suave—more at SUAVE

ur·ban·ite noun : a person who lives in a city

ur·ban·i·ty noun, plural -ties : the quality or state of being urbane

ur·ban·ize verb -ized; -iz·ing : to cause to take on urban characteristics

— ur·ban·i·za·tion noun

ur·chin noun [ORIGIN: ME, hedgehog, fr. AF heriçun, hirechoun, ultim. fr. L ericius]

: a pert or mischievous youngster

Synonyms

devil, hellion, imp, mischief, monkey, rapscallion, rascal, rogue, scamp—more at SCAMP

Ur·du noun [ORIGIN: Hindi & Urdu urdū, fr. Pers zabān-e-urdū-e-muallā language of the Exalted Comp (the imperial bazaar in Delhi)]

: a language that is the official language of Pakistan and that is widely used by Muslims in urban areas of India

urea noun : a soluble nitrogenous compound that is the chief solid constituent of mammalian urine

ure·mia noun : accumulation in the blood of materials normally passed off in the urine resulting in a poisoned condition

— ure·mic adjective

ure·ter noun : a duct that carries the urine from a kidney to the bladder

ure·thra noun, plural -thras or -thrae : the canal that in most mammals carries off the urine from the bladder and in the male also serves to carry semen from the body

— ure·thral adjective

ure·thri·tis noun : inflammation of the urethra

1urge verb urged; urg·ing 1 : to present, advocate, or demand earnestly

2 : to try to persuade or sway <~ a guest to stay>

3 : to serve as a motive or reason for

4 : to impress or impel to some course or activity

Synonyms

[2, 4] egg, encourage, exhort, goad, press, prod, prompt; also drive, propel, spur, stimulate; hurry, hustle, push, rush; beseech, implore, importune; cajole, coax, wheedle; high-pressure, nag, needle, pressure; foment, incite, instigate, provoke, stir (up)

2urge noun 1 : the act or process of urging

2 : a force or impulse that urges or drives

Synonyms

appetite, craving, desire, drive, hankering, hunger, itch, longing, lust, passion, thirst, yearning, yen—more at DESIRE

ur·gent adjective 1 : calling for immediate attention : PRESSING

2 : urging insistently

— ur·gen·cy noun

— ur·gent·ly adverb

Synonyms

acute, critical, dire, imperative, imperious, instant, pressing—more at ACUTE

uric adjective : of, relating to, or found in urine

uric acid noun : a nearly insoluble acid that is the chief nitrogenous excretory product of birds but is present in only small amounts in mammalian urine

uri·nal noun 1 : a receptacle for urine

2 : a place for urinating

uri·nal·y·sis noun : chemical analysis of urine

uri·nary adjective 1 : relating to, occurring in, or being organs for the formation and discharge of urine

2 : of, relating to, or for urine

urinary bladder noun : a membranous sac in many vertebrates that serves for the temporary retention of urine and discharges by the urethra

uri·nate verb -nat·ed; -nat·ing : to release or give off urine

— uri·na·tion noun

urine noun : a waste material from the kidneys that is usu. a yellowish watery liquid in mammals but is semisolid in birds and reptiles

URL noun [ORIGIN: uniform (or universal) resource locator]

: a series of usu. alphanumeric characters that specifies the storage location of a resource on the Internet