Arbor \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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Arbor \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.

Arbor Day, a day appointed for planting trees and shrubs. [U.S.]

Source: Webster's Revised Unabridged Dictionary (1913)