/ Dictionary / Index D drumlin: Meaning and Definition of Find definitions for: drum•lin Pronunciation: (drum'lin), [key] — n. Geol. a long, narrow or oval, smoothly rounded hill of unstratified glacial drift. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: drumlin (Thesaurus) drumhead court-martial drumly Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language