1. the soft, fine feathers of a swan, especially those from the breast
2. a soft, thick cotton fabric with a fuzzy surface resembling swan’s down

Examples

• The pillow was stuffed with genuine swansdown for ultimate softness.
• She wrapped the baby in a blanket made of swansdown fabric.
• The luxury comforter contained swansdown filling.
• The seamstress chose swansdown for the lining of the winter coat.
• Swansdown has been prized for centuries as a filling material.
• The fabric store displayed bolts of white swansdown cotton.