Soft and fluffy like down, or resembling the soft feathers of a bird.
From 'down' (the soft feathers), plus the adjective suffix -y, creating a descriptive term for anything with that feathery, cushioning quality.
The word 'dowy' reminds us that birds' down feathers are so efficient at trapping warm air that they're still used in winter jackets today—nature's original insulation technology!
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