1. A species of sea-duck abounding in the arctic and sub-arctic regions, and producing an uncommonly fine down.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• idear,
• otder,
• rieder,
• ealder,
• eidth,
• enduer,
• inder,
• etier,
• eiter,
• usder,
• eaier,
• eaiser,
• urder,
• editer,
• egde,
• emiter,
• imder,
• deide,
• etiher,
• eitehr

• i'd,
• ID,
• odder,
• wider,
• eden,
• idea,
• cider,
• adder,
• order,
• udder,
• idler,
• elder,
• either,
• tier,
• aide,
• -ed,
• rider,
• Eder,
• eater,
• aid.

The adjective form of the word "eider" is "eiderdown".

The plural of the "eider" can be the "eiders".

The singular of the "eider" can be the "eider".