Origin of drumlinfrom Irish druim, narrow ridge + -lin, diminutive suffix from -ling
An elongated hill or ridge of glacial drift.
Origin of drumlinFrom drum ridge from Irish Gaelic druim back, ridge from Old Irish
An extended, oval hill or ridge of compacted sediment deposited and shaped by a glacier. Drumlins are typically about 30 m (98 ft) high and are longer than they are wide. They have one steep and one gentle slope along their longest axis, which is parallel to the direction of the glacier's movement. The steepest slope faces the direction from which the glacier originated, and the gentler slope faces the direction in which the glacier was advancing.