Glossary · Nouns · U
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TermTypeDefinitionClassificationsUpdated
U.S. Computer Emergency Readiness Team (US-CERT)nounMWEUS-CERT is part of the U.S. Department of Homeland Security's National Cybersecurity and Communications Integration Center. US-CERT is a partnership between the Department of Homeland Security and the public and private sectors, established to protect the nation's Internet infrastructure. US-CERT coordinates defense against and responses to cyber attacks across the nation.Organization
U.S. PersonnounMWEFederal law and Executive Order define a U.S. Person as: a citizen of the United States; an alien lawfully admitted for permanent residence; an unincorporated association with a substantial number of members who are citizens of the U.S. or are aliens lawfully admitted for permanent residence; and/or a corporation that is incorporated in the U.S.IdentityRegulatedPII
U.S.-Controlled FacilitynounMWEBase or building to which access is physically controlled by U.S. individuals who are authorized U.S. government or U.S. government contractor employees.PhysicalRegulatedCUI
U.S.-Controlled SpacenounMWERoom or floor within a facility that is not a U.S.-controlled facility, access to which is physically controlled by U.S. individuals who are authorized U.S. government or U.S. government contractor employees. Keys or combinations to locks controlling entrance to U.S.-controlled spaces must be under the exclusive control of U.S. individuals who are U.S. government or U.S. government contractor employees.PhysicalRegulatedCUI
Ubiquinonenounany of several quinones found in living cells and that function as coenzymes that transfer electrons from one molecule to another in cell respirationverified
Ubiquitousnessnounthe state of being everywhere at once (or seeming to be everywhere at once)verified
Uglinounlarge sweet juicy hybrid between tangerine and grapefruit having a thick wrinkled skinverified
Ugli FruitnounMWElarge sweet juicy hybrid between tangerine and grapefruit having a thick wrinkled skinverified
Ugly DucklingnounMWEan ugly or unpromising child who grows into a beautiful or worthy personverified
Ulamanounthe body of Mullahs (Muslim scholars trained in Islam and Islamic law) who are the interpreters of Islam's sciences and doctrines and laws and the chief guarantors of continuity in the spiritual and intellectual history of the Islamic communityverified
Ulcernouna circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissueverified
Ulcerationnouna circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissueverified
Ulcerative ColitisnounMWEa serious chronic inflammatory disease of the large intestine and rectum characterized by recurrent episodes of abdominal pain and fever and chills and profuse diarrheaverified
Ulemanounthe body of Mullahs (Muslim scholars trained in Islam and Islamic law) who are the interpreters of Islam's sciences and doctrines and laws and the chief guarantors of continuity in the spiritual and intellectual history of the Islamic communityverified
Ulnar ArterynounMWElarge artery that branches from the brachial artery to supply the muscles of the forearm and wrist and handverified
Ulnar NervenounMWEa nerve running along the inner side of the arm and passing near the elbowverified
Ultima ThulenounMWEthe geographical region believed by ancient geographers to be the northernmost land in the inhabited worldverified
Ultimate FrisbeenounMWEa game between two teams whose players try to toss a Frisbee to one another until they cross the opponents goalverified
Ultra forward servicenounMWEThis service allows control over the re-routing of incoming phone calls to pre-determined alternate locations in the event of a telecommunications outage.CapabilityInternal
Ultracrepidarianismnounthe habit or act of giving opinions outside of one's area of expertiseverified
Ultramicroscopenounlight microscope that uses scattered light to show particles too small to see with ordinary microscopesverified
Ultramontanismnoun(Roman Catholic Church) the policy that the absolute authority of the church should be vested in the popeverified
Ultrasonographynounusing the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram)verified
Ultrasoundnounusing the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram)verified
Umbelnounflat-topped or rounded inflorescence characteristic of the family Umbelliferae in which the individual flower stalks arise from about the same pointverified
Umbilical HernianounMWEprotrusion of the intestine and omentum through a hernia in the abdominal wall near the navelverified
Umbilical VesiclenounMWEmembranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functionalverified
Umbrella ArumnounMWEfoul-smelling somewhat fleshy tropical plant of southeastern Asia cultivated for its edible corms or in the greenhouse for its large leaves and showy dark red spathe surrounding a large spadixverified
Umbrella BirdnounMWEblack tropical American bird having a large overhanging crest and long feathered wattleverified
Umbrella MagnolianounMWEsmall deciduous tree of eastern North America having creamy white flowers and large leaves in formations like umbrellas at the ends of branchesverified
Umbrella PinenounMWEmedium-sized two-needled pine of southern Europe having a spreading crownverified
Umbrella PlantnounMWErhizomatous perennial herb with large dramatic peltate leaves and white to bright pink flowers in round heads on leafless stemsverified
Umbrella SedgenounMWEAfrican sedge widely cultivated as an ornamental water plant for its terminal umbrellalike cluster of slender grasslike leavesverified
Umbrella TreenounMWEsmall deciduous tree of eastern North America having creamy white flowers and large leaves in formations like umbrellas at the ends of branchesverified
Umlautnouna diacritical mark (two dots) placed over a vowel in German to indicate a change in soundverified
Unabridged DictionarynounMWEa dictionary that has not been shortened by the omitting terms or definitionsverified
Unainouna sloth of Central America that has two long claws on each forefoot and three long claws on each hindfootverified