Definition of "sheldrake" [shel•drake]

• Any of various large Old World ducks of the genus Tadorna, especially T. tadorna, having predominantly black and white plumage. Also called shelduck. (noun)
• See merganser. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A subspecies of the critically endangered crested shelduck, called Kuroda's sheldrake Tadorna cristata kuroda, once occurred along the southern coast of Korea."
• "Or that I can dive down at one side of a Highland loch and come up at the other like a sheldrake?"
• "The sheldrake ducks also have a fleshy growth on the bill."