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. [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] |