a bar, shaft, or axis that holds, turns, or supports a rotating cutting tool or grinding wheel, often having a tapered shank fitting tightly into the spindle of a machine tool. Compare mandrel.
b.
a beam, shaft, axle, or spindle.
2.
Metallurgy. a reinforcing member of a core or mold.
Origin: 1650–60; resp., by assoc. with arbor3, of earlier arber, arbre < F, OF < L arbor wooden beam or part in an olive press, tree
ar·bor 1 (är'bər) n. A shady resting place in a garden or park, often made of rustic work or latticework on which plants, such as climbing shrubs or vines, are grown.
[Middle English erber, from Old French erbier, garden, from erbe, herb; see herb.]
ar·bor 2 (är'bər) n.
An axis or shaft supporting a rotating part on a lathe.
A bar for supporting cutting tools.
A spindle of a wheel, as in watches and clocks.
pl.ar·bo·res (är'bə-rēz') A tree, as opposed to a shrub.
c.1300, herber, "herb garden," from O.Fr. erbier, from L. herba "grass, herb." Later "a grassy plot" (c.1325), "a shaded nook" (c.1350). Probably not from L. arbor "tree," though influenced by its spelling.