a male mallard.

1805–15; green + head Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
greenhead (ˈɡriːnˌhɛd)
a male mallard

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
See a microscopic close-up of a greenhead fly's multifaceted eyes.
Trap design and color as factors in trapping the salt marsh greenhead fly.
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