u

the 21st letter of the Roman alphabet ; a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons ; a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine ;

u-boat

a submersible warship usually armed with torpedoes ;

u-drive

a rented car; "she picked up a hire car at the airport and drove to her hotel" ;

u-turn

complete reversal of direction of travel ;

u. s. air force

the airforce of the United States of America; the agency that defends the United States through control and exploitation of air and space ;

u. s. army

the army of the United States of America; the agency that organizes and trains soldiers for land warfare ;

u. s. army special forces

a division of the United States Army that is specially trained for guerilla fighting ;

u. s. coast guard

an agency of the Department of Transportation responsible for patrolling shores and facilitating nautical commerce ;

u. s. code

a consolidation and codification by subject matter of the general and permanent laws of the United States; is prepared and published by a unit of the United States House of Representatives ;

u.k.

a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland ;

u.s.

the executive and legislative and judicial branches of the federal government of the United States ; North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776 ;

u.s. army criminal investigation laboratory

a defense laboratory of the Criminal Investigation Command; the United States Army's primary forensic laboratory in support of criminal intelligence ;

u.s. congress

the legislature of the United States government ;

u.s. government

the executive and legislative and judicial branches of the federal government of the United States ;

u.s. house

the lower legislative house of the United States Congress ;

u.s. house of representatives

the lower legislative house of the United States Congress ;

u.s. mint

the mint that manufactures and distributes United States coins for circulation through Federal Reserve Banks; processes gold and silver bullion ;

u.s. national library of medicine

the world's largest medical library ;

u.s. senate

the upper house of the United States Congress ;

u.s. waters

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.a.

North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776 ;

u308

an impure mixture of uranium oxides obtained during the processing of uranium ore ;

uakari

medium-sized tree-dwelling monkey of the Amazon basin; only New World monkey with a short tail ;

ubermensch

a person with great powers and abilities ;

ubiety

the state of existing and being localized in space ;

ubiquinone

any of several quinones found in living cells and that function as coenzymes that transfer electrons from one molecule to another in cell respiration ;

ubiquitousness

the state of being everywhere at once (or seeming to be everywhere at once) ;

ubiquity

the state of being everywhere at once (or seeming to be everywhere at once) ;

ubykh

a virtually extinct Caucasian language spoken exclusively in Turkey ;

uca

fiddler crabs ;

uda

the major Protestant paramilitary group in Northern Ireland; responsible for bombing the homes of Catholics and for criminal racketeering and selling drugs ;

udder

mammary gland of bovids (cows and sheep and goats) ;

udmurt

the Finnic language spoken by the Votyak ; a member of the Finno-Ugric-speaking people living in eastern European Russia ;

udometer

gauge consisting of an instrument to measure the quantity of precipitation ;

ufa

a city in the European part of Russia ;

ufo

an (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins ;

uganda

a landlocked republic in eastern Africa; achieved independence from the United Kingdom in 1962 ;

ugandan

a native or inhabitant of Uganda ;

ugandan monetary unit

monetary unit in Uganda ;

ugandan shilling

the basic unit of money in Uganda; equal to 100 cents ;