What is drumlin?

drumlin meaning in Soil Science terminology / glossary / dictionary is:
A low, smooth, elongated oval hill, mound, or ridge of compact till that may or may not have a core of bedrock or stratified drift. The longer axis is parallel to the general direction of glacier flow. Drumlins are products of streamline (laminar) flow of glaciers, which molded the subglacial floor through a combination of erosion and deposition.


reference: Soil Science Society of America