| 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] |
| unaccepted |
combined form of accepted. |