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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.
unaccented combined form of accented.
unacceptable not approved of or permissible because of not meeting certain standards or expectations. [2 definitions]