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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.
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 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.
arbitrage the purchase of a security or commodity in one financial market and its immediate resale in a different market, used as a way to profit from the difference in market prices. [3 definitions]
arbitrager one that engages in arbitrage.
arbitrament the act of arbitrating. [2 definitions]
arbitrary resulting from whim or caprice instead of from a rule or reason. [3 definitions]
arbitrate to decide as an arbiter. [4 definitions]