mammary gland

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of the milk-producing glands in female mammals, consisting of lobes containing clusters of alveoli with a system of ducts to convey the milk to an external nipple or teat. These glands typically occur in pairs and begin secreting milk when young are born.

from the GNU version of the Collaborative International Dictionary of English.

• noun The milk-secreting organ of female mammals.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun anatomy A gland that secretes milk for suckling an infant or offspring.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun milk-secreting organ of female mammals