umbilical vesicle
— Noun
– English
~ membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
Urban VI
— Noun
– English
~ Italian pope from 1378 to 1389 whose contested election began the Great Schism; he alienated his political allies by his ruthless treatment of his opponents (1318-1389)
Urban VIII
— Noun
– English
~ Italian pope from 1623 to 1644 who sanctioned the condemnation of Galileo but later freed him (1568-1644)
ultra vires
— Adverb
– English
~ beyond the scope or in excess of legal power or authority
ultra vires
— Adjective
– English
~ beyond the legal power or authority of a person or official or body etc; "an ultra vires contract"
United States Virgin Islands
— Noun
– English
~ more than 130 southeastern Virgin Islands; a dependent territory of the United States
unit of viscosity
— Noun
– English
~ a unit of measurement for viscosity
Upper Volta
— Noun
– English
~ a desperately poor landlocked country in western Africa; was formerly Upper Volta under French rule but gained independence in 1960
uninominal voting system
— Noun
– English
~ based on the principle of having only one member (as of a legislature) selected from each electoral district
United States Civil War
— Noun
– English
~ civil war in the United States between the North and the South; 1861-1865
United States waters
— Noun
– English
~ territorial waters included within a distance of 12 nautical miles of the coasts of the United States and its territories; "ships operating in United States waters must adhere to United States laws and regulations"
U.S. waters
— Noun
– English
~ territorial waters included within a distance of 12 nautical miles of the coasts of the United States and its territories; "ships operating in United States waters must adhere to United States laws and regulations"
under way
— Adverb
– English
~ in motion; set in motion; "the ship got under way"
under the weather
— Adjective
– English
~ somewhat ill or prone to illness; "my poor ailing grandmother"; "feeling a bit indisposed today"; "you look a little peaked"; "feeling poorly"; "a sickly child"; "is unwell and can't come to work"