A mound of glacial drift WordNet 3.0 & Open English WordNet

A drumlin, from the Irish word droimnín, first recorded in 1833, in the classical sense is an elongated hill in the shape of an inverted spoon or half-buried egg formed by glacial ice acting on underlying unconsolidated till or ground moraine. Wikipedia

Elongated hill Wikidata

An elongated hill or ridge of glacial drift. Wiktionary