Ar¶blast (?), n. A crossbow. See Arbalest. Ar¶bor (?), n. [OE. herber, herbere, properly a garden of herbs, F. herbier, fr. L. herbarium. See Herb, and cf. Herbarium.] A kind of latticework formed of, or covered with, vines, branches of trees, or other plants, for shade; a bower. Sir P. Sidney. Ar¶bor, n. [Written also arbour.] [L., a tree, a beam.] 1. (Bot.) A tree, as distinguished from a shrub. 2. [Cf. F. arbre.] (Mech.) (a) An axle or spindle of a wheel or opinion. (b) A mandrel in lathe turning. Knight. ÷ Day, a day appointed for planting trees and shrubs. [U.S.] Ar¶boÏraÏry (?), a. [L. arborarius, fr. arbor tree.] Of or pertaining to trees; arboreal. Ar¶boÏra·tor (?), n. [L., fr. arbor tree.] One who plants or who prunes trees. [Obs.] Evelyn. Ø Ar¶bor DiÏa¶n‘ (?). [L., the tree of Diana, or silver.] (Chem.) A precipitation of silver, in a beautiful arborescent form. ArÏbo¶reÏal (?), a. 1. Of or pertaining to a tree, or to trees; of nature of trees. Cowley. 2. Attached to, found in or upon, or frequenting, woods or trees; as, arboreal animals. Woodpeckers are eminently arboreal. Darwin. Ar¶bored (?), a. Furnished with an arbor; lined with trees. ½An arboreal walk.¸ Pollok. ArÏbo¶reÏous (?), a. [L. arboreous, fr. arbor tree.] 1. Having the form, constitution, or habits, of a proper tree, in distinction from a shrub. Loudon. 2. Pertaining to, or growing on, trees; as, arboreous moss. Quincy. Ar·boÏres¶cence (?), n. The state of being arborescent; the resemblance to a tree in minerals, or crystallizations, or groups of crystals in that form; as, the arborescence produced by precipitating silver. Ar·boÏres¶cent (?), a. [L. arborescens, p. pr. of arborescere to become a tree, fr. arbor tree.] Resembling a tree; becoming woody in stalk; dendritic; having crystallizations disposed like the branches and twigs of a tree. ½Arborescent hollyhocks.¸ Evelyn. Ar¶boÏret (?), n. [OF. arboret, dim. of arbre tree, L. arbor] A small tree or shrub. [Obs.] Spenser. Among thickÐwoven arborets, and flowers Imbordered on each bank. Milton. Ø Ar·boÏre¶tum (?), n.; pl. Arboreta (?). [L., a place grown with trees.] A place in which a collection of rare trees and shrubs is cultivated for scientific or educational purposes. ArÏbor¶icÏal (?), a. Relating to trees. [Obs.] ArÏbor¶iÏcole (?), a. [L. arbor + colere to inhabit.] (Zo”l.) TreeÐinhabiting; Ð said of certain birds. Ar·borÏiÏcul¶turÏal (?), a. Pertaining to arboriculture. Loudon. Ar·borÏiÏcul¶ture (?; 135), n. [L. arbor tree + cultura. See Culture.] The cultivation of trees and shrubs, chiefly for timber or for ornamental purposes. Ar·borÏiÏcul¶turÏist, n. One who cultivates trees. ArÏbor¶iÏform (?), a. Treelike in shape. Ar¶borÏist (?), n. [F. arboriste, fr. L. arbor tree.] One who makes trees his study, or who is versed in the knowledge of trees. Howell. Ar·borÏiÏza¶tion (?), n. [Cf. F. arborisation, fr. L. arbor tree.] The appearance or figure of a tree or plant, as in minerals or fossils; a dendrite. Ar¶borÏized (?), a. Having a treelike appearance. ½An arborized or moss agate.¸ Wright. Ar¶borÏous (?), a. Formed by trees. [Obs.] From under shady, arborous roof. Milton. Ar¶bor vine· (?). A species of bindweed. Ø Ar¶bor vi¶t‘ (?). [L., tree of life.] 1. (Bot.) An evergreen tree of the cypress tribe, genus Thuja. The American species is the T. occidentalis. 2. (Anat.) The treelike disposition of the gray and white nerve tissues in the cerebellum, as seen in a vertical section. Ar¶busÏcle (?), n. [L. arbuscula small tree, shrub, dim. of arbor tree.] A dwarf tree, one in size between a shrub and a tree; a treelike shrub. Bradley. ArÏbus¶cuÏlar (?), a. Of or pertaining to a dwarf tree; shrublike. Da Costa. ArÏbus¶tive (?), a. [L. arbustivus, fr. arbustum place where trees are planted.] Containing copses of trees or shrubs; covered with shrubs. Bartram. Ar¶buÏtus (?), Ar¶bute (?), } n. [L. arbutus, akin to arbor tree.] The strawberry tree, a genus of evergreen shrubs, of the Heath family. It has a berry externally resembling the strawberry; the arbute tree. Trailing arbutus (Bot.), a creeping or trailing plant of the Heath family (Epig‘a repens), having white or usually roseÐcolored flowers with a delicate fragrance, growing in small axillary clusters, and appearing early in the spring; in New England known as mayflower; Ð called also ground laurel. Gray. Arc (?), n. [F. arc, L. arcus bow, ~. See Arch, n.] 1. (Geom.) A portion of a curved line; as, the arc of a circle or of an ellipse. 2. A curvature in the shape of a circular ~ or an arch; as, the colored arc (the rainbow); the arc of Hadley's quadrant. 3. An arch. [Obs.] Statues and trophies, and triumphal arcs. Milton. 4. The apparent ~ described, above or below the horizon, by the sun or other celestial body.