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u the twenty-first letter of the English alphabet. [2 definitions]
udder a large organ with two or more glands, each with its own nipple. Udders are the organs in mammals such as cows and goats from which the offspring drink milk.
UFO abbreviation of "unidentified flying object."
Uganda an East African country between Kenya and the Democratic Republic of the Congo. The capital of Uganda is Kampala.
ugly unpleasant to look at; not attractive. [3 definitions]
Ukraine a country in eastern Europe. Kyiv is the capital of Ukraine.
Ukrainian of or having to do with Ukraine or its people, culture, language, or the like. [2 definitions]
ukulele a musical instrument that looks like a small guitar with four strings. The ukulele was brought from Portugal to Hawaii, where it became very popular.
ulcer an open sore on the body. Ulcers produce pus and are found on the skin or in the stomach or small intestine.
ultra- a prefix that means "above" or "beyond." [2 definitions]
umbilical cord a cord that connects an unborn baby to its mother. The umbilical cord supplies nourishment to the fetus and takes away wastes.
umbrella a screen made of fabric stretched over a folding frame. An umbrella is used to shield against the rain or sun.
umpire a person who rules on plays in a game; referee. [2 definitions]
UN abbreviation of "United Nations."
un- a prefix that means "not." [2 definitions]
unable not having the power, skill, or means needed to do something; not able.
unanimous in complete agreement. [2 definitions]
unaware not knowing or realizing; not conscious of. [2 definitions]
unawares by surprise or in a way that was not expected.
unbeaten not defeated or outdone. [2 definitions]
unbecoming not attractive or proper on a particular person. [2 definitions]