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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]
Arab League a confederation of nations sharing a common Arabic language and culture, formed in 1945 to promote economic, military, and political cooperation among its members, and now grown to a total of twenty-one.
Arab Republic of Egypt see Egypt.
arachibutyrophobia the persistent fear of or intense distress caused by peanut butter sticking to the roof of one's mouth.
arachidonic acid an unsaturated fatty acid that is an important component of the cell membrane and is considered an essential nutrient in the diet of most mammals, including humans.
arachnid an arthropod having four pairs of legs and belonging to the class that includes scorpions, ticks, and spiders.
arachnoid an arachnid. [5 definitions]
arachnophobia an irrational fear of spiders.
arak see arrack.
Aral Sea formerly, a very large, single lake in Central Asia. Once one of the world's largest lakes, the Aral Sea has vastly diminished in volume of water and has divided into separate parts as a result of the diversion, for agricultural purposes, of the rivers that fed the lake. The southeastern part of the Aral Sea has become entirely dry.
Aramaic the Semitic language of ancient Syria, Palestine, and Southwest Asia. [3 definitions]
Arapaho a member of a North American Indian tribe that formerly lived in the western plains from Texas and New Mexico to Canada, and now lives in Oklahoma and Wyoming. [2 definitions]
arapaima a very large edible fish of the rivers of the Amazon region.
araroba a bitter yellow medicinal powder obtained from cavities in the trunk of a Brazilian tree; Goa powder. [2 definitions]
araucaria a cone-bearing evergreen native to the Southern Hemisphere and grown as an ornamental elsewhere.
Arawak a member of an Indian people once widespread throughout the West Indies, now living chiefly in northern South America. [2 definitions]
Arawakan a family of South American Indian languages that includes Arawak.
arbalest a medieval missile-launching weapon whose design is similar to that of a crossbow.
arbiter someone who has the authority to decide an issue or settle a dispute; arbitrator.