What does mammillary mean?
Mammillary is an anatomical adjective meaning resembling a nipple or relating to the breast or nipple. Its best-known use is in the term “mammillary bodies,” which names two small, rounded structures on the underside of the brain involved in memory and spatial orientation. The word can also describe anatomical features that are nipple-shaped, especially small projections or rounded formations. Because it derives from Latin and is used mainly in scientific and medical writing, mammillary has a specialized, formal register. It is useful when reading anatomy, neuroscience, or biological descriptions where precise shape and location matter.
adjectiveResembling or connected with a nipple or the breast. In anatomy, it may also refer to structures that are small, rounded, and nipple-like in shape.
- Resembling a nipple or breast.
- Of or relating to the nipple or breast.
- Describing certain anatomical structures that are small, rounded, or nipple-like in form.
"The mammillary bodies are a pair of small structures located on the underside of the brain."
"The mammillary bodies play roles in memory and spatial orientation."
"The specimen showed small mammillary projections along its surface."
Your brain contains a pair of mammillary bodies—tiny, rounded structures whose name comes from their supposed resemblance to nipples.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does mammillary come from?
Mammillary comes through New Latin from Latin mammilla, a diminutive of mamma, meaning “breast” or “udder.” The Latin diminutive mammilla literally suggested a small breast or nipple. English later adopted the related adjective mammillary, while scientific terminology applied it to rounded anatomical structures resembling the original form.
How mammillary is actually used
This is a technical or formal anatomical term. It is not normally used in general conversation, except in specialized biological contexts.
Easily confused with mammillary
Mammillary is an adjective describing something resembling or relating to a nipple; mammillary is not a separate standard headword.