Definitions

1. noun

A small rounded projection or elevation, especially one resembling a nipple, such as the small bumps on the surface of a leaf or the skin of a breast.

“The tiny mammillae on the surface of the leaf added to its aesthetic appeal.”

2. noun

Small rounded projections or bumps on the surface of a breast or other part of the body, especially the nipple-like projections on the areola.

“The mammillae on the mother’s breast made it difficult for the baby to latch on.”