| uprising |
the act or an instance of rebelling or rising up against authority; insurrection. |
| uproar |
a loud, confused disturbance; commotion; tumult. [2 definitions] |
| uproot |
to pull up or tear out of the ground by the roots. [2 definitions] |
| upset |
to tip over; overturn. [13 definitions] |
| upside down |
with the part that is normally underneath on top; inverted. [2 definitions] |
| upstairs |
on or toward an upper floor; up the stairs. [4 definitions] |
| up to |
as far upward as. [7 definitions] |
| up-to-date |
having the most recent information; current. [2 definitions] |
| upward |
toward or to a higher position or place. [5 definitions] |
| 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) |
| Uranus |
the third largest planet in the solar system and seventh from the sun, having twenty-seven satellites and a diameter of about 31,500 miles. [2 definitions] |
| urban |
of or pertaining to a city or town. [3 definitions] |
| Urdu |
the official literary language of Pakistan, written with Persian-Arabic characters, and widely used by Muslims in India. |
| urge |
to push or drive forward or onward. [7 definitions] |
| urgent |
requiring immediate action or attention; pressing. [3 definitions] |
| urine |
a waste substance secreted by the kidneys and excreted as a yellowish fluid by mammals or as a semisolid by reptiles and birds. |
| URL |
abbreviation of "uniform resource locator," an address identifying the location of a file on the Internet, consisting of an identifier for the computer on which the file is located and the file's location on that computer. |
| urn |
a large vase, usu. with a pedestal or base. [3 definitions] |
| Ursa Major |
a circumpolar constellation in the northern sky, located between Ursa Minor and Leo and containing a double star, Mizar; Big Dipper. |
| Ursa Minor |
a circumpolar constellation in the northern sky, located between Ursa Major and Cassiopeia and containing the North Star, Polaris; Little Dipper. |