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aqueous of, relating to, or similar to water. [3 definitions]
aqueous humor a clear, watery liquid that fills the chambers between the cornea and the lens of the eye.
aquiculture the growing of plants, often for their edible fruits, in nutrient water or water-soaked inert material rather than in soil; hydroponics. [2 definitions]
aquifer a bed of rock, sand, or gravel that can hold great quantities of water and supplies it to wells and springs.
Aquila a summer constellation in the northern sky, located between Lyra and Capricornus and the bright star Altair; Eagle.
aquiline of or resembling an eagle. [2 definitions]
-ar1 of or pertaining to. [2 definitions]
-ar2 one that acts as an agent or performs.
Ar symbol of the chemical element argon.
AR abbreviation of "Arkansas," a south central U.S. state between Mississippi and Oklahoma.
Arab a member of the Semitic people that originated in Arabia and now forms the dominant population in that and other Middle Eastern countries. [4 definitions]
arabesque a complex design of interlaced scrolls, foliage, and other fanciful shapes, or an ornamental object having such a design. [4 definitions]
Arabia a Southwest Asian peninsula between the Red Sea and the Persian Gulf.
Arabian of, pertaining to, originating in, or characteristic of Arabia or its desert climate. [4 definitions]
Arabian camel the single-humped camel native to the area from North Africa to India; dromedary. (Cf. Bactrian camel.)
Arabian Desert a very arid region occupying a large portion of the Arabian Peninsula and stretching into Jordan and Iraq.
Arabian Peninsula a peninsula in western Asia that lies between the Red Sea to the west and the Persian Gulf to the northeast. The Indian Ocean borders the Arabian Peninsula on the southeast. Countries located on the peninsula include Saudi Arabia, Yemen, Oman, United Arab Emirates, Qatar, Bahrain, and Kuwait.
Arabian Sea an extension of the Indian Ocean between India and the Arabian Peninsula.
Arabic designating, pertaining to, or in the script used to write the Semitic language of the Arabs, or Persian, Urdu, and other languages. [3 definitions]
Arabic numeral any of the symbols for the numbers one through nine, including zero; 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9.
arable of land, capable of yielding crops when cultivated. [2 definitions]