mammary

American

[mam-uh-ree] / ˈmæm ə ri /

adjective

Anatomy, Zoology.

of or relating to the mamma or breast.

mammary British

/ ˈmæmərɪ /

adjective

of, relating to, or like a mamma or breast

"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

Other Word Forms

Derived Forms

Etymology

Origin of mammary

First recorded in 1675–85; mamm(a) ² + -ary

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

To test whether this approach could work in living organisms, the scientists treated mice that had aggressive mammary tumors that are typically difficult to treat.

From Science Daily • Mar. 12, 2026

The EU has already defined dairy items as products coming from the "normal mammary secretion".

From BBC • Oct. 8, 2025

These babies even share the mighty boob: breaking a "rule" of mammal biology, naked mole rats do not have just around half as many babies as they have mammary glands.

From Salon • May 11, 2025

“The reason is because Holsteins produce more milk. So they have more volume for the virus to enjoy,” she said, noting research showing the virus’ affinity for mammary tissue.

From Los Angeles Times • Oct. 20, 2024

Udder, ud′ėr, n. the mammary glands of various animals, esp. cows, &c.—adjs.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023