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

 

glacier

 noun
noun
BrE BrE//ˈɡlæsiə(r)//
 
; NAmE NAmE//ˈɡleɪʃər//
 
Other geographic regions, Mountains and valleys
 
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a large mass of ice, formed by snow on mountains, that moves very slowly down a valley See related entries: Other geographic regions, Mountains and valleys Word Origin mid 18th cent.: from French, from glace ‘ice’, based on Latin glacies.
See the Oxford Advanced American Dictionary entry: glacier