Longman Dictionary of Contemporary English
The Collaborative International Dictionary
mammary gland \mammary gland\ n. The milk-secreting organ of female mammals.
Syn: mamma.
Wiktionary
n. (context anatomy English) A gland that secretes milk for suckle an infant or offspring.
WordNet
n. milk-secreting organ of female mammals [syn: mamma]
Wikipedia
A mammary gland is an exocrine gland in mammals that produces milk to feed young offspring. Mammals get their name from the word "mammary". The mammary glands are arranged in organs such as the breasts in primates (for example, humans and chimpanzees), the udder in ruminants (for example, cows, goats, and deer), and the dugs of other animals (for example, dogs and cats). Lactorrhea, the occasional production of milk by the glands, can occur in any mammal, but in most mammals lactation, the production of enough milk for nursing, occurs only in phenotypic females who have gestated in recent months or years. It is directed by hormonal guidance from sex steroids. In a few mammalian species, male lactation can occur.