| aqueduct |
a channel or pipe built to carry water over a long distance. [2 definitions] |
| aquifer |
a layer of rock, sand, or gravel that contains water from which wells and springs are supplied. |
| -ar1 |
a suffix that means "of" or "relating to." [2 definitions] |
| AR |
abbreviation of "Arkansas." |
| Arab |
a member of a southwest Asian people that makes up most of the population of Arabia and other parts of the Middle East. [4 definitions] |
| Arabia |
a peninsula in southwest Asia between the Red Sea and the Persian Gulf. |
| Arabian |
of, having to do with, or characteristic of Arabia or its desert climate. [3 definitions] |
| Arabian Desert |
a very dry region that covers a large part of Saudi Arabia, Yemen, and Oman, and stretches into Jordan and Iraq. |
| Arabian Peninsula |
a peninsula in the Middle East on which lie the countries of Saudi Arabia, Yemen, Oman, United Arab Emirates, Qatar, Bahrain, and Kuwait. The peninsula lies between the Red Sea to the west and the Persian Gulf to the northeast. The Indian Ocean borders the peninsula on the southeast. |
| Arabian Sea |
an arm of the Indian Ocean that lies between India and the Arabian Peninsula. |
| Arabic |
of or having to do with Arabia or Arabs; Arabian. [2 definitions] |
| Arabic numeral |
any of the symbols for the numbers zero through nine; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. |
| arable |
capable of being farmed. |
| Aral Sea |
formerly, a very large, single lake in Central Asia. Once one of the world's largest lakes, the Aral Sea has lost a great deal of its water in recent times and it has divided into separate parts. The southeastern part of the Aral Sea has become entirely dry and is called a desert now. |
| arbitrary |
resulting from personal opinions, wishes, or feelings instead of from a rule or reason. |
| arbitrate |
to make a decision about or settle. [2 definitions] |
| arbor1 |
a shady area made by arranging trees and bushes or by growing vines on a frame. |
| arbour |
a spelling of "arbor" used in Canada and Britain. See "arbor" for more information. |
| arc |
any curved line; anything shaped like a bow or curve. |
| arcade |
a row of arches connected to form a passageway. [2 definitions] |
| arch1 |
a curved structure made out of stone or brick and used to span an open space such as a door. [4 definitions] |