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powder down

noun
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Definition of powder down

: modified down feathers in some birds (as herons, parrots, tinamous, frogmouths) that grow continuously and disintegrate at the ends

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“Powder down.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/powder%20down. Accessed 17 Jan. 2021.

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