eiderdown noun2 •The down of the eider duck, used for stuffing pillows and quilts.A great sea lifted us high and, crashing down with a deafening roar, carried us swiftly along on light foam as soft as eiderdown. — 1929 •A quilt stuffed with this down.She jerked up in bed, clutching the eiderdown; her heart beat. What could it be? — 1920 formseiderdowns
