dormouse

The story

1. Old Norse · derived fromdár“benumbed”
2. Middle English · inherited fromdormowse
3. English todaydormouse

From Middle English dormowse, of uncertain origin. Possibly from a dialectal *dor-, from Old Norse dár (“benumbed”) + mous (“mouse”). More at doze, mouse. The word is sometimes conjectured to come from an Anglo-Norman derivative of Old French dormir (“to sleep”) (as *dormouse (“tending to be dormant”), with second element mistaken for mouse), but no such Anglo-Norman term is known to have existed.