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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.
arbour a spelling of "arbor" used in Canada and Britain. See "arbor" for more information.
arbovirus any of a number of viruses that are transmitted by certain blood-sucking arthropods such as mosquitoes and ticks and that may cause encephalitis, yellow fever, or dengue fever.
arbutus an evergreen tree or shrub of the heath family having broad dark green leaves and bearing clusters of pink or white flowers and small strawberrylike fruit. [2 definitions]
arc any curved line; anything shaped like a bow or curve. [4 definitions]
arcade a series of arches connected and supported by pillars, columns, or the like. [3 definitions]
Arcadia an isolated mountainous region in southern Greece, associated in ancient times with rustic simplicity and innocence.
Arcadian of or pertaining to Arcadia. [4 definitions]
arcane of a secret or esoteric nature; mysterious; abstruse.
arcanum (often pl.) a deep secret or mystery, as of nature. [3 definitions]