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

 

drumlin

 noun
noun
BrE BrE//ˈdrʌmlɪn//
 
; NAmE NAmE//ˈdrʌmlɪn//
 
(geology) Mountains and valleys
 
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a very small hill formed by the movement of a glacier (= a large moving mass of ice) See related entries: Mountains and valleys Word Origin mid 19th cent.: probably from drum ‘a long narrow hill’ + -lin (from -ling).
See the Oxford Advanced American Dictionary entry: drumlin