| Udder 1. (n.) The glandular organ in which milk is secreted and stored; -- popularly called the bag in cows and other quadrupeds. See Mamma. 2. (n.) One of the breasts of a woman. Thesaurus Entries bag, boobs, bosom, breast, breasts, brisket, bust, chest, crop, dug, knockers, mama, mamelon, mamelonation, mammary gland, mammilla, mammillation, nenes, nipple, pap, papilla, pigeon breast, teat, thorax, tit, tits, titties, titty |