From The Collaborative International Dictionary of English v.0.48:
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.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Arbor \Ar"bor\, n. [Written also arbour.] [L., a tree, a beam.]
1. (Bot.) A tree, as distinguished from a shrub.
[1913 Webster]
2. [Cf. F. arbre.] (Mech.)
(a) An axle or spindle of a wheel or opinion.
(b) A mandrel in lathe turning. --Knight.
[1913 Webster]