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uh-uh used to indicate a negative response.
U-joint variant of universal joint.
UK abbreviation of "United Kingdom," a northwestern European country between the Atlantic Ocean and the North Sea, comprising Great Britain and Northern Ireland; United Kingdom of Great Britain and Northern Ireland (usu. prec. by, "the").
ukase in imperial Russia, a proclamation of the czar that was legally binding. [2 definitions]
Ukraine an East European country bordered by Poland, Russia, and the Black Sea; formerly a republic of the Soviet Union.
Ukrainian of or pertaining to Ukraine or its people, culture, language, or the like. [3 definitions]
ukulele a small guitarlike musical instrument with four strings that was popularized in Hawaii.
ulcer an inflamed open sore on or in the body that is marked by death of tissue and the production of pus, esp. such a sore in the stomach or small intestine. [2 definitions]
ulcerate to develop an ulcer, as an infected wound. [2 definitions]
ulcerous characterized by or having an ulcer or ulcers. [2 definitions]
-ule small.
-ulent characterized by, esp. in quantity; full of; abounding in.
ulna the bone of the human forearm that is on the side opposite the thumb. [2 definitions]
-ulous tending to; characterized by.
Ulster (informal) Northern Ireland. [3 definitions]
ulterior beyond or excluded from what is openly admitted or shown, esp. when concealed for the purposes of deception. [3 definitions]
ultima the last syllable of a word.
ultimate last or farthest in a progression; final. [9 definitions]
ultimately at the farthest or last point in a progression; finally; in the end.
ultima Thule the farthest point or limit; utmost degree. [2 definitions]
ultimatum a final statement of demands, esp. when issued with a threat of action if rejected, as in a diplomatic discussion.