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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Ar·bor, n. [Written also arbour.]
 1. Bot. A tree, as distinguished from a shrub.
 2.  Mech. (a) An axle or spindle of a wheel or opinion. (b) A mandrel in lathe turning.
 Arbor Day, a day appointed for planting trees and shrubs. [U.S.]
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From: WordNet (r) 2.0

 Arbor Day
      n : a day designated for planting trees