Arbor

1. n. A mandrel in lathe turning.
2. n. A kind of latticework formed of, or covered with, vines, branches of trees, or other plants, for shade; a bower.
3. n. A tree, as distinguished from a shrub.
4. n. An axle or spindle of a wheel or opinion.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.