mammillary

These geodes, on breaking, often present a mammillary surface.

It occurs in mammillary rounded masses, with a fibrous structure, and a dull metallic lustre.

Much haematite occurs in a compact or massive form, often mammillary, and presenting on fracture a fibrous structure.

A considerable number of the prehistoric dress-fasteners, known as mammillary fibulæ, have been discovered in Ireland.

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