| airborne | (adjective) moved or conveyed by or through air | - |
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| arbor | (noun) a framework that supports climbing plants | Synonyms: arbour, bower, pergola |
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| (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: mandrel, mandril, spindle |
| (noun) tree (as opposed to shrub) | - |
| arboraceous | (adjective) abounding in trees | Synonyms: arboreous, woodsy, woody |
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| arborary | (adjective) of or relating to or formed by trees | Synonyms: arboreal, arborical, arborous |
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| arboreal | (adjective) inhabiting or frequenting trees | Synonyms: arboreous, tree-living |
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| (adjective) of or relating to or formed by trees | Synonyms: arborary, arborical, arborous |
| (adjective) resembling a tree in form and branching structure | Synonyms: arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| arboreous | (adjective) inhabiting or frequenting trees | Synonyms: arboreal, tree-living |
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| (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| (adjective) abounding in trees | Synonyms: arboraceous, woodsy, woody |
| arborescent | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arboresque | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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| arborical | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborous |
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| arboriculture | (noun) the tending of and caring for trees | Synonyms: tree farming |
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| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arboriform | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arborise | (verb) branch out like trees | Synonyms: arborize |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| arborize | (verb) branch out like trees | Synonyms: arborise |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| arborous | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborical |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arborvitae | (noun) any of several Asian and North American conifers of the genera Thuja and Thujopsis | - |
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| carborundum | (noun) an abrasive composed of silicon carbide crystals | - |
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| counterbore | (noun) a bit for enlarging the upper part of a hole | Synonyms: countersink, countersink bit |
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| harbor | (noun) a place of refuge and comfort and security | Synonyms: harbour |
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| (noun) a sheltered port where ships can take on or discharge cargo | Synonyms: harbour, haven, seaport |
| (verb) maintain (a theory, thoughts, or feelings) | Synonyms: bear, entertain, harbour, hold, nurse |
| (verb) hold back a thought or feeling about | Synonyms: harbour, shield |
| (verb) keep in one's possession; of animals | Synonyms: harbour |
| (verb) secretly shelter (as of fugitives or criminals) | Synonyms: harbour |
| harborage | (noun) (nautical) a place of refuge (as for a ship) | Synonyms: harbourage |
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| nonarboreal | (adjective) not inhabiting or frequenting trees | - |
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| waterborne | (adjective) supported by water | - |
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| (adjective) transported by water | - |