Etymology

drumlin

drum·lin
D2R1U1M3L1I1N1

Today it means: An elongated hill or ridge of glacial drift. Full definition →

Irish droim
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The story

  1. Irish · borrowed fromdroim“back, ridge”
  2. English todaydrumlin

From Irish droim (“back, ridge”) + English diminutive suffix -lin (“variant of -ling”).

Etymology from Wiktionary, CC BY-SA 4.0.