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Definition of green wall noun from the Oxford Advanced Learner's Dictionary

green wall

noun
 
/ˈɡriːn wɔːl/
 
/ˈɡriːn wɔːl/
(also living wall)
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  1. a structure covered in plants that can be attached to the wall of a building
    • a 12-storey green wall
    • The client wants a green wall installed in his house.
    • A green wall will improve the energy balance and aid biodiversity.
    Topics Buildingsc1

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