mammillary

[ mam-uh-ler-ee ]

/ ˈmæm əˌlɛr i /

of, relating to, or resembling a mammilla.

Origin of mammillary

First recorded in 1605–15; mammill(a) + -ary

in·ter·mam·mil·lar·y, adjective post·mam·mil·lar·y, adjective

Locality near Adelaide, now showing gold freely in mammillary and dendroidal form.

Getting Gold |J. C. F. Johnson
Much haematite occurs in a compact or massive form, often mammillary, and presenting on fracture a fibrous structure.

Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 |Various
It occurs in mammillary rounded masses, with a fibrous structure, and a dull metallic lustre.

Geology |James Geikie
These geodes, on breaking, often present a mammillary surface.

Summary Narrative of an Exploratory Expedition to the Sources of the Mississippi River, in 1820 |Henry Rowe Schoolcraft

These are of a circular and mammillary form: they are strewed thickly, like little islets, approximating to each other.

Remarks on some fossil impressions in the sandstone rocks of Connecticut River |John Collins Warren