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

 

green roof

 noun
noun
BrE
 
; NAmE
 
(also living roof
BrE
 
; NAmE
 
)
 
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a type of roof that has plants growing on it that help to keep the building cool in summer and warm in winter The firm designs and installs green roof systems. Green roofs reduce the amount of storm water running off into drains.
See the Oxford Advanced American Dictionary entry: green roof