any of various large diving ducks, such as the eider and the scoter, that occur along coasts
sea duck in American English
noun
any of various diving ducks, as the scaups, goldeneyes, scoters, and eiders, foundprincipally on seas
Word origin
[1745–55]This word is first recorded in the period 1745–55. Other words that entered Englishat around the same time include: coda, compressor, input, personification, vignette