swansdown

swan's-down

also swans·down (swŏnz′doun′)n.1. The soft down of a swan.2. A soft woolen or wool and silk fabric.3. Flannelette.

swans•down

(ˈswɒnzˌdaʊn)

n. 1. the down or under plumage of a swan, used for trimming, powder puffs, etc. 2. a sturdy cotton flannel with a thickly napped face. [1600–10]
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