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esker

noun [C]
 
 
/ˈes.kər/ US  /-kɚ/ specialized

Definition

a long, narrow, raised line of earth, small stones, and sand left on the earth's surface where melted ice once flowed under a glacierHills and mountains
(Definition of esker noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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