Definition of mamelon in English:



  • A small rounded structure, e.g. the central knob of a tubercle on a sea urchin.

    • ‘Thus, though in Arceuthobium the mamelon is always free from the ovary walls, in Loranthus a series can be traced through forms in which there is a temporary chamber filled by later growth of the mamelon.’
    • ‘The second type is similar to the first in having laminae and possibly pillars, yet it lacks the mamelons.’
    • ‘The only adults with mamelons have an ‘open bite,’ which means that the front teeth don't touch each other, and the wearing off of the mamelons doesn't take place.’
    • ‘On females note the uterus, ovary, vulva, and on males note the testis, ejaculatory duct, and the mamelons.’
    • ‘Associated with mamelons are canals called astrorhizae.’


Mid 19th century: from French, nipple, from mamelle breast, from Latin mamilla little breast.