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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]
unabsorbed combined form of absorbed.
unabsorbent combined form of absorbent.
unacademic combined form of academic.
unacademically combined form of academically.