Definify.com
Webster 1913 Edition
Arbor
Ar′bor
,Noun.
[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.]
Webster 1828 Edition
Arbor
'ARBOR
,Noun.
1.
A frame of lattice work, covered with vines, branches of trees or other plants, for shade; a bower.2.
In botany, a tree, as distinguished from a shrub. The distinction which Linne makes, that a tree springs up with a bud on the stem, and a shrub not, is found not to hold universally; and the tree, in popular understanding, differs from the shrub only in size. Arbor forms the seventh family of vegetables in Linne's system. [See Tree.]3.
In mechanics, the principal part of a machine, sustaining the rest. Also the axis or spindle of a machine, as of a crane, or windmill.This in America is called the shaft.