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

 

understorey

 noun
(North American English understory (pl. understories))noun
BrE BrE//ˈʌndəstɔːri//
 
; NAmE NAmE//ˈʌndərstɔːri//
 
 
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a layer of plants, bushes, etc. that is found underneath the main canopy of a forest (= the top leaves and branches of the trees that form a thick layer)