mammillary

adjective

mam·​mil·​la·​ry ˈma-mə-ˌler-ē How to pronounce mammillary (audio) ma-ˈmi-lə-rē How to pronounce mammillary (audio)
variants or mamillary
1
: of, relating to, or affecting a nipple, breast, or duct of the mammary gland
mammillary tissue
a mammillary fistula
2
a
: resembling a breast or nipple especially in having a rounded shape
the mammillary process of a lumbar vertebra
b
: studded with breast-shaped protuberances
mammillary forms of agate
3
: of or relating to a mammillary body
the mammillary region of the brain
mammillary nuclei

Examples of mammillary in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
For example: The Rorschach task strongly activated the anterior section of the thalamus, a large portion of the pulvinar, and part of the mammillary bodies. Neuroskeptic, Discover Magazine, 20 Feb. 2017

Word History

Etymology

earlier mammillar "shaped like a nipple" (borrowed from Medieval Latin mammillāris, from Latin mammilla, mamilla "breast, nipple"—diminutive of mamma "breast"—+ -āris -ar) + -ary entry 2 — more at mamma entry 1

First Known Use

1615, in the meaning defined at sense 2a

Time Traveler
The first known use of mammillary was in 1615

Browse Nearby Entries

Cite this Entry

“Mammillary.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mammillary. Accessed 28 Feb. 2025.

Medical Definition

mammillary

adjective
mam·​mil·​la·​ry
variants or mamillary
1
: of, relating to, or affecting a nipple, breast, or duct of the mammary gland
mammillary tissue
a mammillary fistula
2
: resembling a breast or nipple especially in having a rounded shape
the mammillary process of a lumbar vertebra
3
: of or relating to a mammillary body
the mammillary region of the brain
mammillary nuclei
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!