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aquarium a tank or other container filled with water in which water animals and plants are kept. [2 definitions]
Aquarius a constellation located between Capricorn and Pisces. Aquarius is also called the Water Bearer. [3 definitions]
aquatic of or taking place on the water. [2 definitions]
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 an abbreviation for 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.
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.