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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]
unbelievable	astounding or very hard to believe.
uncanny	beyond ordinary human or natural means or ability.
uncertain	not known for sure; not definite. [3 definitions]
uncle	the brother or brother-in-law of one's father or mother. [2 definitions]
unclear	hard to understand; confusing. [2 definitions]
Uncle Sam	a cartoon person that represents the government or people of the United States. Uncle Sam is a tall, thin man with a beard, top hat, and trousers that have red and white stripes. [2 definitions]
uncomfortable	feeling discomfort; not comfortable. [2 definitions]
uncommon	unusual or rare.
unconscious	not conscious or aware. [3 definitions]

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