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umbilical of, concerning, or resembling a navel or an umbilical cord. [3 definitions]
umbilical cord a tough, flexible cord that connects the navel of a fetus to the placenta of its mother and that supplies nourishment to, and removes wastes from, the fetus.
umbilicus the central depression on the surface of the abdomen at which the umbilical cord was attached to the fetus; navel. [2 definitions]
umbra a shadow or darkened area. [2 definitions]
umbrage a feeling of offense, irritation, or resentment (usu. prec. by take).
umbrella a usu. portable or movable shield against the rain or sun, consisting of a collapsible canopy attached to and supported on radiating ribs joined to a central rod or stick. [4 definitions]
umbrella bird any of several black birds of South and Central America with an umbrellalike crest.
umbrella plant a grasslike aquatic African plant with a triangular stem crowned by an umbrellalike growth of leaves and green spikelets.
umbrella tree an American magnolia, having umbrella-shaped clusters of leaves and bearing red fruit and white flowers with an unpleasant odor. [2 definitions]
umiak a large open Eskimo boat made of a wooden frame covered with animal hides, and paddled like a canoe.
umlaut a change in the sound of a vowel due to influence by a following vowel or semivowel, or the vowel so changed. [3 definitions]
ump (informal) umpire.
umpire one appointed to rule on plays in a game, esp. a professional performing that function in a baseball game; referee. [4 definitions]
umpteen (informal) many, or seemingly uncountable.
UN (used with a sing. or pl. verb) abbreviation of "United Nations," (used with a sing. or pl. verb) an international organization founded in 1945 to promote world peace, security, cooperation, and understanding.
un- not. [2 definitions]
unabashed not feeling or showing embarrassment, uneasiness, or shame.
unabbreviated combined form of abbreviated.
unable lacking the necessary power, skill, or means; not able; incapable.
unabraded combined form of abraded.
unabridged not condensed or shortened; complete. [2 definitions]