Definition of Mammary gland

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Mammary gland: One of the two half-moon-shaped glands on either side of the adult female chest, which with fatty tissue and the nipple make up the breast. Within each mammary gland is a network of sacs that produce milk during lactation and send it to the nipple via a system of ducts.

Undeveloped mammary glands are present in female children and in males.

See also Breast, Lactation.