More soft, fluffy, or covered with down feathers; more downy in quality or appearance.
'Downier' is the comparative form of 'downy,' which comes from 'down' (from Old Norse 'dúnn'), referring to the soft feathers of birds. The '-er' suffix (Old English 'ra') creates the comparative degree.
Down feathers are so incredibly efficient at trapping warm air that they're still the gold standard for insulation in winter clothing—nature engineered the perfect insulator millions of years ago!
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