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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]
arbitration the consideration and decision of an issue or dispute by an arbiter. [2 definitions]
arbitrator a person chosen to mediate and resolve disputes or controversies. [2 definitions]
arbor1 an arrangement of trees, vines, shrubs, or flowers, often supported by a lattice framework and forming a shady bower or shelter.
arbor2 the shaft or axis which turns or supports a rotating cutting tool such as a lathe.
arbor3 in botany, a tree.
Arbor Day in the United States, a spring day set aside for the planting of trees in the community.
arboreal of, like, formed by, or pertaining to trees. [2 definitions]
arborescent treelike in shape or size.
arboretum a place where trees are grown for scientific study and display.
arborist a person with specialized knowledge of trees and experience in their care.
arborvitae any of various evergreens having small cones and leaves of closely overlapping scales, often grown as an ornamental shrub or tree.
arbor vitae the treelike structure of the white matter in the cerebellum when viewed in longitudinal cross section.