mammillary /ˈmamɪləɹi/adjective 2noun 2forms 3 adjective2 •Pertaining to the nipples.On the other hand, no woman who had ever borne a child (even in her own childhood) could be accepted, no matter how free she was of mammilary blemishes. — 1969 •Resembling a breast or nipple in shape or form. noun2 •A mammillary body, one of a pair of small round bodies, located on the undersurface of the brain, that form part of the limbic system. •A carbonate coating formed through the precipitation of calcium carbonate onto existing rock below the water surface in cave pools. formsmammillaries · more mammillary · most mammillary