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whistling swan

noun
  1. the small North American subspecies, Cygnus columbianus columbianus, of the tundra swan.
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Origin of whistling swan

First recorded in 1775–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for whistling swan

whistling swan

noun
  1. a white North American swan, Cygnus columbianus, with a black bill and straight neckCompare mute swan
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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