| 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. |
| 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] |