| tyranny |
a government in which a single person rules absolutely and in a cruel way. [2 definitions] |
| tyrant |
a ruler who governs absolutely with unfairness and cruelty. [2 definitions] |
| tzar |
another spelling of czar. |
| 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] |