| 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) | - |
| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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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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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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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 |
| harborage | (noun) (nautical) a place of refuge (as for a ship) | Synonyms: harbourage |
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