Definition of "arbor"

arbor¹

/ˈɑːbə/

noun
plural arbors or arbores
1. A shady sitting place or pergola usually in a park or garden, surrounded by climbing shrubs, vines or other vegetation.
  Quotations
  Children swung from the branches of the banyan tree, teenagers climbed into the arbours of orchids and gourds into which the abandoned cars had been transformed.
  1979, J.G. Ballard, The Unlimited Dream Company, chapter 24
2. A grove of trees.

arbor²

/ˈɑːbə/

noun
plural arbors or arbores
1. An axis or shaft supporting a rotating part on a lathe.
2. A bar for supporting cutting tools.
3. A spindle of a wheel.