Definition of arbour noun from the Oxford Advanced Learner's Dictionary

 

arbour

 noun
(US English arbor)noun
BrE BrE//ˈɑːbə(r)//
 
; NAmE NAmE//ˈɑːrbər//
 
 
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a shelter in a garden/yard for people to sit under, made by growing climbing plants over a frame Word Origin Middle English (also denoting a lawn or flower bed): from Old French erbier, from erbe ‘grass, herb’, from Latin herba. The phonetic change to ar- (common in words having er- before a consonant) was assisted by association with Latin arbor ‘tree’.
See the Oxford Advanced American Dictionary entry: arbour