a small diving duck, Histrionicus histrionicus, of North America and Iceland, the male of which has bluish-gray plumage marked with black, white, and chestnut.
Origin of harlequin duck
First recorded in 1765–75
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a northern sea duck, Histrionicus histrionicus, the male of which has a blue and red plumage with black and white markings
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