drum·lin
noun/ˈdrʌmlɪn/
/ˈdrʌmlɪn/
(geology)- a very small hill formed by the movement of a glacier (= a large moving mass of ice)
由冰川运动形成的一座非常小的山丘（=大量移动的冰块） Word Originmid 19th cent.: probably from drum ‘a long narrow hill’ + -lin (from -ling).