eiderdown
Concise Oxford English Dictionary © 2008 Oxford University Press:
eiderdown/ˈʌɪdədaʊn/
▶noun
- 1 Brit. a quilt filled with down (originally from the eider) or another soft material.
- 2 (eider down) small soft feathers from the breast of the female eider duck.
'eiderdown' also found in these Oxford entries:

