Definition of Mergus
: a genus of highly aquatic diving ducks including several typical mergansers having males that are brightly marked and develop an eclipse plumage
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of mergus
New Latin, from Latin, diver (waterfowl), from mergere to dip, plunge — more at merge
Seen and Heard
What made you want to look up Mergus? Please tell us where you read or heard it (including the quote, if possible).