( BrE ) ( NAmE arbor ) / ˈɑːbə(r); NAmE ˈɑːrb-/ noun
a shelter in a garden / yard for people to sit under, made by growing climbing plants over a frame
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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.