Definify.com
Webster 1913 Edition
Mammillary
1.
Of or pertaining to the mammilla, or nipple, or to the breast; resembling a mammilla; mammilloid.
2.
(Min.)
Composed of convex convex concretions, somewhat resembling the breasts in form; studded with small mammiform protuberances.
Webster 1828 Edition
Mammillary
MAM'MILLARY
,Adj.
1.
In mineralogy, applied to minerals composed of convex concretions.