swansdown

• swan's-down, swan's down

swansdown (usually uncountable, plural swansdowns)

1. The down of a swan.
   • 1920, Katherine Mansfield [pseudonym; Kathleen Mansfield Murry], “Revelations”, in Bliss and Other Stories, London: Constable & Company, published 1920, →OCLC, pages 266–267:

     Oh, to be free of Princes' at one-thirty, of being the tiny kitten in the swansdown basket, of being the Arabian, and the grave, delighted child and the little wild creature. . . .

2. A soft woolen fabric; flannelette.

• swandowns