| 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] |
| arc furnace |
an electric furnace in which heat is produced by an arc formed between the material being heated and an electrode, or between two electrodes. |
| -arch |
leader; ruler. |
| arch1 |
a structural element, usu. of masonry, that is curved and used to span an open space such as a door. [5 definitions] |
| arch2 |
mischievous, sly, or teasing. |
| arch- |
principal; main. [3 definitions] |
| archaeo- |
ancient. |
| archaeoastronomy |
the study of the astronomy of prehistoric cultures. |