drum·lin 
(drŭmlĭn)
(drŭmlĭn)n.
An elongated hill or ridge of glacial drift.
[From drum, ridge, from Irish Gaelic druim, back, ridge, from Old Irish.]
drumlin- imperial
- imperialism
- imperialist
- imperialistic
- imperialistically
- imperially
- imperial moth
- Imperial Valley
- imperil
- imperilment
- imperious
- imperiously
- imperiousness
- imperishability
- imperishable
- imperishableness
- imperishably
- imperium
- impermanence
- impermanency
- impermanent
- impermeability
- impermeable
- impermeableness
- impermeably