- any of the compound accessory reproductive organs of female mammals that occur in pairs on the chest or ventral surface and contain milk-producing lobes with ducts that empty into an external nipple, becoming functional when young are born and secreting milk for the duration of suckling.
Origin of mammary gland
First recorded in 1825–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Related Wordschest, bosom, nipple, heart, breast, front, bust, udder, mammilla, teat, peritoneum, ribs, thorax
- any of the milk-producing glands in mammals. In higher mammals each gland consists of a network of tubes and cavities connected to the exterior by a nipple
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- Any of the milk-producing apocrine glands typically occurring in pairs in female mammals and consisting of lobes containing clusters of alveoli with a system of ducts to convey the milk to an external nipple or teat.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- One of the glands in female mammals that produces milk. It is present but undeveloped in the male. In most animals, the gland opens onto the surface by means of a nipple or teat. Mammary glands number from 2 to 20, depending on the species.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.