Both Uses

arbor
in
The Bean Trees
(Edited)

The gravel path cut through the middle of the park from a penis-type monument, up at the street near Mattie's, down to the other end where we liked to sit in a place Lou Ann called the arbor.
Chpt 8.

arbor = a framework that supports climbing plants; or a shady rest area made by such a framework or by trees and shrubs
It wasn't unreasonably hot yet, and the kids were bouncing around the house like superballs (this was mainly Turtle, with Dwayne Ray's participation being mainly vocal), so we took them out to sit under the arbor for a while.
Chpt 10. *

Definitions:

(1) (arbor as in: shaded arbor)
a framework that supports climbing plants; or a shady rest area made by such a framework or by trees and shrubs

The framework of an arbor is generally thought of as a wood lattice made to support vines, but it can also be a natural framework such as trees.
(2) (meaning too rare to warrant focus)
Less commonly arbor can be used as a proper noun to reference a location such as Ann Arbor, Michigan. As a common noun, it can also reference various types of rotating machine shafts.