also swans·down(swŏnz′doun′)n.1. The soft down of a swan.2. A soft woolen or wool and silk fabric.3. Flannelette.
swan's-down
n1. (Textiles) the fine soft down feathers of a swan, used to trim powder puffs, clothes, etc2. (Textiles) a thick soft fabric of wool with silk, cotton, or rayon, used for infants' clothing, etc3. (Textiles) a cotton fabric with a heavy napTranslations