arbor

Etymology 1

From Middle English arbour, erbour, from Old French erbier (“field, meadow, kitchen garden”), from erbe (“grass, herb”), from Latin herba (“grass, herb”) (English herb). (Compare Late Latin herbārium, although erbier is possibly an independent formation.) The spelling was influenced by Latin arbor (“tree”).

noun

1. A shady sitting place or pergola usually in a park or garden, surrounded by climbing shrubs, vines or other vegetation.
   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.

Etymology 2

Borrowed from French arbre (“tree, axis”), spelling influenced by Latin arbor (“tree”).

noun

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.