Both Uses of

arbor

in

The Ramayana

Again he turned him to explore Each chamber, hall, and corridor, And arbour bright with scented bloom, And lodge and cell and picture-room.†
Book 5 *

unconventional spelling: This is a British spelling. Americans use arbor.

Each arbour clad with climbing bloom, Each grotto, cell, and picture room, Each lawn by beast and bird enjoyed, Each walk and terrace was destroyed.†
Book 5

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)
Much more rarely, an arbor can be used as a proper noun to reference a location. As a common noun, it can also reference various types of rotating machine shafts.