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

 

mountainboard

 noun
noun
BrE BrE//ˈmaʊntənbɔːd//
 
; NAmE NAmE//ˈmaʊntnbɔːrd//
 
(also all-terrain board
BrE
 
; NAmE
 
)
 
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a short narrow board with wheels like a skateboard that can be used for going down mountains
See the Oxford Advanced American Dictionary entry: mountainboard