(countable) Anas platyrhynchos, a common and widespread dabbling duck, natively found throughout the Northern Hemisphere, whose male has a distinctive dark green head.
(uncountable) The meat of this bird, eaten as food.
From Middle English malard, mawlard, mawdelard, from Old French malard, malart, mallart (“male wild duck”), from Old French male, masle (“male”) + -ard, -art. Cognate with Medieval Latin maslardus, mallardus.