greenhead

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green·head

 (grēn′hĕd′)
n.
1. A male mallard duck.
2. Any of several horseflies having green eyes, found especially in coastal regions.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

greenhead

(ˈɡriːnˌhɛd)
n
(Animals) a male mallard
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014