An Etymological Dictionary of Astronomy and Astrophysics

The small conical projection in the centre of the areola of each breast, which in women contains the outlet of the milk ducts. Also called: mamilla, papilla or teat (TheFreeDictionary).

Etymology (EN): M.E. nyppell, neple, “teat,” from neble, diminutive of neb “bill, beak,” + -le, → -ule.

Etymology (PE): Mamak, diminutive of mame “breast” in child language, maybe related to mâm, → mother.