Words beginning with UR

193 words and phrases start with the letters UR.

Ur(noun) an ancient city of Sumer located on a former channel of the Euphrates River
uracil(noun) a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with…
uraemia(noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine
uraemic(adjective) of or involving excess nitrogenous waste products in the urine (usually due to kidney insufficiency)
Ural-Altaic(noun) a (postulated) group of languages including many of the indigenous languages of Russia (but not Russian)
Ural Mountains(noun) a mountain range in western Russia extending from the Arctic to the Caspian Sea; forms part of the…
Uralic(noun) a family of Ural-Altaic languages
Uralic language(noun) a family of Ural-Altaic languages
Urals(noun) a mountain range in western Russia extending from the Arctic to the Caspian Sea; forms part of the…
uranalysis(noun) (medicine) the chemical analysis of urine (for medical diagnosis)
Urania(noun) (Greek mythology) the Muse of astronomy
uraninite(noun) a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and…
uranium(noun) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and…
uranium 235(noun) a uranium isotope with mass number 235; capable of sustaining chain reactions
uranium 238(noun) the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces…
uranium ore(noun) any ore from which uranium can be extracted
uranologist(noun) a physicist who studies astronomy
uranology(noun) the branch of physics that studies celestial bodies and the universe as a whole
uranoplasty(noun) surgical correction of a defect of the palate
Uranoscopidae(noun) stargazers
Uranus(noun) (Greek mythology) god of the heavens; son and husband of Gaea and father of the Titans in ancient mythology
uranyl(noun) the bivalent radical UO2 which forms salts with acids
uranyl group(noun) the bivalent radical UO2 which forms salts with acids
uranyl nitrate(noun) a yellow salt obtained by the reaction of uranium salts with nitric acid
uranyl oxalate(noun) a salt obtained by the reaction of uranium salts with oxalic acid
uranyl radical(noun) the bivalent radical UO2 which forms salts with acids
urarthritis(noun) a painful inflammation of the big toe and foot caused by defects in uric acid metabolism resulting in…
urate(noun) a salt of uric acid
uratemia(noun) presence of abnormal amounts of uric acid salts in the blood; symptom of gout
uraturia(noun) presence of abnormally large amounts of uric acid in the urine; symptom of gout
urban(adjective) relating to or concerned with a city or densely populated area
urban area(noun) a geographical area constituting a city or town
urban center(noun) a large and densely populated urban area; may include several independent administrative districts
urban guerrilla(noun) a guerrilla who fights only in cities and towns
Urban II(noun) French pope from 1088 to 1099 whose sermons called for the First Crusade (1042-1099)
urban legend(noun) a story that appears mysteriously and spreads spontaneously in various forms and is usually false; contains…
urban planning(noun) the branch of architecture dealing with the design and organization of urban space and activities
urban renewal(noun) the clearing and rebuilding and redevelopment of urban slums
urban sprawl(noun) an aggregation or continuous network of urban communities
urban typhus(noun) acute infection caused by rickettsia and transmitted by the bite of an infected flea; characterized by fever…
Urban V(noun) French pope from 1362 to 1370 who tried to reestablish the papacy in Rome but in 1367 returned to Avignon…
Urban VI(noun) Italian pope from 1378 to 1389 whose contested election began the Great Schism; he alienated his political…
Urban VIII(noun) Italian pope from 1623 to 1644 who sanctioned the condemnation of Galileo but later freed him (1568-1644)
Urbana(noun) a university town in east central Illinois adjoining Champaign
urbane(adjective) showing a high degree of refinement and the assurance that comes from wide social experience
urbanely(adverb) in an urbane manner
urbanisation(noun) the condition of being urbanized
urbanise(verb) make more industrial or city-like
urbanised(adjective) made urban in nature; taking on urban characteristics
urbanity(noun) polished courtesy; elegance of manner
urbanization(noun) the condition of being urbanized
urbanize(verb) make more industrial or city-like
urbanized(adjective) made urban in nature; taking on urban characteristics
urceolate(adjective) urn-shaped; large below and contracted toward the mouth
urceole(noun) a vessel that holds water for washing the hands
urchin(noun) poor and often mischievous city child
Urd(noun) goddess of fate: a giantess who personified the past
Urdu(noun) the official literary language of Pakistan, closely related to Hindi; widely used in India (mostly by…
urea(noun) the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as…
urea-formaldehyde resin(noun) a clear thermosetting resin made from urea and formaldehyde and used in electrical fittings, adhesives, and…
urease(noun) an enzyme that catalyzes the hydrolysis of urea into carbon dioxide and ammonia; is present in intestinal…
Uredinales(noun) rust fungi: parasitic fungi causing rust in plants; sometimes placed in
uremia(noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine
uremic(adjective) of or involving excess nitrogenous waste products in the urine (usually due to kidney insufficiency)
ureter(noun) either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder
ureteritis(noun) inflammation of the ureter
ureterocele(noun) prolapse of the end of the ureter into the bladder; may obstruct urine flow
ureterorenal reflux(noun) a backflow of urine from the ureter into the renal pelvis
ureterostenosis(noun) stenosis of the ureter
urethane(noun) an ester of carbamic acid
urethra(noun) duct through which urine is discharged in most mammals and which serves as the male genital duct
urethral(adjective) of or relating to the urethra
urethral orifice(noun) the orifice through which urine is discharged
urethral sphincter(noun) a striated sphincter muscle that constricts the urethra
urethritis(noun) inflammation of the urethra; results in painful urination
urethrocele(noun) prolapse of the urethra into the vagina
Urex(noun) antibacterial agent (trade names Mandelamine and Urex) that is contained in many products that are used to…
Urey(noun) United States chemist who discovered deuterium (1893-1981)
Urga(noun) the capital and largest city of Mongolia
urge(verb) force or impel in an indicated direction
urge incontinence(noun) urinary incontinence that is generally attributable to involuntary contracts of the bladder muscle resulting…
urge on(verb) force or impel in an indicated direction
urgency(noun) the state of being urgent; an earnest and insistent necessity
urgent(adjective) compelling immediate action
urgently(adverb) with great urgency
Urginea(noun) Mediterranean liliaceous plants; sometimes placed in family Hyacinthaceae
Urginea maritima(noun) having dense spikes of small white flowers and yielding a bulb with medicinal properties
urging(noun) a verbalization that encourages you to attempt something
Uria(noun) murres
Uria aalge(noun) the most frequent variety of murre
Uria lomvia(noun) a variety of murre
Uriah(noun) (Old Testament) the husband of Bathsheba and a soldier who was sent to die in battle so that king David could…
urial(noun) bearded reddish sheep of southern Asia
uric(adjective) in or relating to or obtained from urine
uric acid(noun) a white tasteless odorless crystalline product of protein metabolism; found in the blood and urine
uricaciduria(noun) presence of abnormal amounts of uric acid in the urine; symptom of gout
uricosuric(adjective) acting to increase the excretion of uric acid in the urine
Urim and Thummim(noun) lots thrown to determine God's answers to yes-no questions
urinal(noun) a plumbing fixture (usually attached to the wall) used by men to urinate
urinalysis(noun) (medicine) the chemical analysis of urine (for medical diagnosis)

urinary(adjective) of or relating to the function or production or secretion of urine
urinary apparatus(noun) the system that includes all organs involved in reproduction and in the formation and voidance of urine
urinary bladder(noun) a membranous sac for temporary retention of urine
urinary calculus(noun) a calculus formed in the kidney
urinary hesitancy(noun) difficulty in beginning the flow of urine; associated with prostate enlargement in men and with narrowing of…
urinary incontinence(noun) inability to control the flow of urine and involuntary urination
urinary organ(noun) an organ that separates waste substances from the blood and discharges them
urinary retention(noun) holding urine in the urinary bladder
urinary system(noun) the system that includes all organs involved in reproduction and in the formation and voidance of urine
urinary tract(noun) the organs and tubes involved in the production and excretion of urine
urinary tract infection(noun) any infection of any of the organs of the urinary tract
urinate(verb) pass after the manner of urine
urination(noun) the discharge of urine
urinator(noun) a person who urinates
urine(noun) liquid excretory product
uriniferous tubule(noun) any of the small tubules that are the excretory units of the vertebrate kidney
URL(noun) the address of a web page on the world wide web
Urmia(noun) a shallow saline lake in northwestern Iran between Tabriz and the western border of Turkey
urn(noun) a large vase that usually has a pedestal or feet
urn-shaped(adjective) having a concave shape like an urn
urn fungus(noun) an urn-shaped discomycete with a nearly black interior
Urnula craterium(noun) an urn-shaped discomycete with a nearly black interior
urobilin(noun) brown bile pigment formed from urobilinogens and found in feces and in small amounts in urine
urobilinogen(noun) a chromogen formed in the intestine from the breakdown of bilirubin; yields urobilins on oxidation; some is…
urocele(noun) extravasation of urine into the scrotal sac
urochesia(noun) passage of urine from the anus
urochezia(noun) passage of urine from the anus
urochord(noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva
Urochorda(noun) tunicates
Urochordata(noun) tunicates
urochordate(noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva
Urocyon(noun) grey foxes
Urocyon cinereoargenteus(noun) dark grey American fox; from Central America through southern United States
Urocystis(noun) a genus of smut fungi belonging to the family Tilletiaceae
Urocystis cepulae(noun) smut fungus causing blackish blisters on scales and leaves of onions; especially destructive to seedlings
Urocystis tritici(noun) fungus affecting leaves and stems of wheat
urodele(noun) amphibians that resemble lizards
Urodella(noun) salamanders; newts; congo snakes
urodynia(noun) pain during urination
urogenital(adjective) of or relating to the urinary and reproductive systems
urogenital apparatus(noun) the system that includes all organs involved in reproduction and in the formation and voidance of urine
urogenital cleft(noun) the fissure between the labia majora
urogenital medicine(noun) the branch of medicine that deals with the diagnosis and treatment of disorders of the urinary tract or…
urogenital system(noun) the system that includes all organs involved in reproduction and in the formation and voidance of urine
urokinase(noun) protease produced in the kidney that converts plasminogen to plasmin and so initiates fibrinolysis
urolith(noun) a urinary stone
urologist(noun) a specialist in urology
urology(noun) the branch of medicine that deals with the diagnosis and treatment of disorders of the urinary tract or…
uropathy(noun) any pathology of the urinary tract
Urophycis(noun) hakes
Uropsilus(noun) shrew moles
Uropsilus soricipes(noun) shrew mole of eastern Asia
Uropygi(noun) whip scorpions
uropygial gland(noun) oil-secreting gland situated at the base of the tail in most birds
uropygium(noun) posterior part of a bird's body from which the tail feathers grow
Urosaurus(noun) a reptile genus of Iguanidae
Urosaurus ornatus(noun) a climbing lizard of western United States and northern Mexico
Ursa Major(noun) a constellation outside the zodiac that rotates around the North Star
Ursa Minor(noun) a constellation outside the zodiac that rotates around the North Star
Ursidae(noun) bears and extinct related forms
ursine(adjective) of or relating to or similar to bears
ursine dasyure(noun) small ferocious carnivorous marsupial having a mostly black coat and long tail
ursinia(noun) any of various plants of the genus Ursinia grown for their yellow- or orange- or white-rayed flowers
Ursus(noun) type genus of Ursidae: brown bears; in some classifications genus Ursus includes all bears
Ursus americanus(noun) brown to black North American bear; smaller and less ferocious than the brown bear
Ursus arctos(noun) large ferocious bear of Eurasia
Ursus arctos horribilis(noun) powerful brownish-yellow bear of the uplands of western North America
Ursus arctos middendorffi(noun) brown bear of coastal Alaska and British Columbia
Ursus arctos syriacus(noun) yellowish-grey Syrian brown bear
Ursus horribilis(noun) powerful brownish-yellow bear of the uplands of western North America
Ursus Maritimus(noun) white bear of Arctic regions
Ursus middendorffi(noun) brown bear of coastal Alaska and British Columbia
Ursus thibetanus(noun) bear with a black coat living in central and eastern Asia
Ursus ursinus(noun) common coarse-haired long-snouted bear of south-central Asia
Urth(noun) goddess of fate: a giantess who personified the past
Urtica(noun) a nettle yielding fiber resembling flax
Urtica dioica(noun) perennial Eurasian nettle established in North America having broad coarsely toothed leaves with copious…
Urtica pipulifera(noun) annual European nettle with stinging foliage and small clusters of green flowers
Urticaceae(noun) a family of plants of order Urticales including many nettles with stinging hairs
Urticales(noun) an order of dicotyledonous plants including Moraceae and Urticaceae and Ulmaceae
urticaria(noun) an itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the…
urticate(verb) whip with or as with nettles
urtication(noun) an itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the…
Urubupunga(noun) a waterfall in the Parana river in Brazil
Urubupunga Falls(noun) a waterfall in the Parana river in Brazil
Uruguay(noun) a South American republic on the southeast coast of South America; achieved independence from Brazil in 1825
Uruguay potato(noun) South American potato vine
Uruguay potato vine(noun) South American potato vine
Uruguay River(noun) a South American river that arises in southern Brazil and flows south to the Rio de la Plata; the northern…
Uruguayan(adjective) of or relating to or characteristic of Uruguay or its people
Uruguayan monetary unit(noun) monetary unit in Uruguay
Uruguayan peso(noun) the basic unit of money in Uruguay; equal to 100 centesimos
urus(noun) large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle