n 1 : a fluid secreted by the mammary glands of females for the nourishment of their young : esp : cow's milk used as a food by humans 2 : LACTATION 2 <cows in > vt 1 a : to draw milk from the breasts or udder of b : to draw (milk) from the breast or udder 2 : to induce (a snake) to eject venom vi : to draw or yield milk .
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