Mallard definitions

măl'ərd
A wild duck (Anas platyrhynchos) found almost worldwide, the male of which has a green head and neck. Most domestic ducks descend from the mallard.
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The common wild duck (Anas platyrhynchos), from which the domestic duck is descended: the male has a green or bluish-black head, a thin band of white around the neck, and a rusty breast.
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A common and widespread dabbling duck, Anas platyrhynchos, whose male has a distinctive dark green head.
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Origin of mallard

Middle English malarde from Old French malart mallard drake possibly from male male male -art, -ard -ard