Mammillary \Mam"mil*la*ry\, a. [Cf. F. mammilaire. See Mammilla.]

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.

Source: Webster's Revised Unabridged Dictionary (1913)