swans·down | \ ˈswänz-ˌdau̇n 
\
\Definition of swansdown
1 : the soft downy feathers of the swan often used as trimming on articles of dress
2 : a heavy cotton flannel that has a thick nap on the face and is made with sateen weave
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Time Traveler for swansdown
The first known use of swansdown was in 1606
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