a small Eurasian
merganser (Mergus albellus
), the male of which has a white crest
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'smew'var. of smee, akin to obs. Du sme(ente), MHG smiche, kind of small duck