| upthrust |
a thrust in an upward direction. |
| uptight |
(informal) tense or nervous. [3 definitions] |
| up to |
as far upward as. [7 definitions] |
| up-to-date |
having the most recent information; current. [2 definitions] |
| up to date |
fully informed; knowing the most recent information (often fol. by "on," "as to," or "with regard to"). [3 definitions] |
| up to snuff |
(informal) up to a particular standard; in satisfactory or good shape. |
| up to something |
involved in something suspicious or secretive. |
| uptown |
toward or in the higher, wealthier, or more northern part of a city or town. [3 definitions] |
| upturn |
to turn over, up, or upward. [4 definitions] |
| upward |
toward or to a higher position or place. [5 definitions] |
| upward mobility |
movement to a higher status in society, or the ability to so move. |
| upward of |
more than. |
| upwards of |
more than. |
| upwelling |
an act or instance of flowing upward or as if from a deep source. [2 definitions] |
| upwind |
in or toward the direction from which the wind is blowing. [2 definitions] |
| uracil |
a pyrimidine compound essential to life, important in metabolism and as a precursor of RNA. |
| Ural |
(pl.) a mountain range in Russia, extending from the Arctic Ocean to near the Caspian Sea and forming a border between Europe and Asia; Ural Mountains. [3 definitions] |
| Ural-Altaic |
a hypothetical language group consisting of all the Uralic and Altaic languages. |
| Uralic |
a language family containing the Hungarian, Finnish, and Estonian languages and the Finno-Ugric and Samoyed subfamilies. |
| Ural Mountains |
a mountain range in Russia, extending from the Arctic Ocean to near the Caspian Sea and forming a border between Europe and Asia; Urals. |
| uranium |
a radioactive chemical element that has ninety-two protons in each nucleus and that occurs in pure form as a heavy silvery-white metal, used as a fissionable nuclear fuel. (symbol: U) |