A person who sleeps a great deal, or who falls asleep readily (by analogy with the sound hibernation of the dormouse).
Origin
From Middle English dormous, of uncertain origin. Possibly from a dialectal *dor-, from Old Norse dár ("benumbed") + mous. More at doze, mouse.
The word is sometimes conjectured to come from an Anglo-Norman derivative of Old French dormir ("to sleep") (as *dormouse, with second element mistaken for mouse), but no such Anglo-Norman term is known to have existed.
Modern English dictionary
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