merganser

[mer-gan-ser]
noun, plural mer·gan·sers, (especially collectively) mer·gan·ser.
  1. any of several fish-eating diving ducks of the subfamily Merginae, having a narrow bill hooked at the tip and serrated at the edges.

Origin of merganser

1745–55; < New Latin, equivalent to Latin merg(us) diver, a kind of water bird + ānser goose
Also called fish duck.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for merganser

merganser

noun plural -sers or -ser
  1. any of several typically crested large marine diving ducks of the genus Mergus, having a long slender hooked bill with serrated edgesAlso called: sawbill See also goosander

Word Origin for merganser

C18: from New Latin, from Latin mergus waterfowl, from mergere to plunge + anser goose
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

Word Origin and History for merganser
n.

type of duck, 1752, coined in Modern Latin (1550s), from Latin mergus "waterfowl, diver" (from mergere "to dip, immerse;" see merge (v.)) + anser "goose" (see goose (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper