any of numerous ducks, common in coastal bays and river mouths, that typically dive from the water's surface for their food (contrasted with dabbling duck).
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Origin of diving duck
First recorded in 1805–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
any of various ducks, such as the pochard, scaup, redhead, and canvasback, that inhabit bays, estuaries, lakes, etc, and can dive and swim beneath the surface of the water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012