a. [ Cf. F. mammilaire. See Mammilla. ] 1. Of or pertaining to the mammilla, or nipple, or to the breast; resembling a mammilla; mammilloid. [ 1913 Webster ]

2. (Min.) Composed of convex convex concretions, somewhat resembling the breasts in form; studded with small mammiform protuberances. [ 1913 Webster ]