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

 

mountainside

 noun
noun
BrE BrE//ˈmaʊntənsaɪd//
 
; NAmE NAmE//ˈmaʊntənsaɪd//
 
Mountains and valleys
 
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the side or slope of a mountain Tracks led up the mountainside. The helicopter crashed into the mountainside. See related entries: Mountains and valleys
See the Oxford Advanced American Dictionary entry: mountainside