n. pl. mam·mil·lae (-mĭlē) 1. A nipple or teat. 2. A nipple-shaped protuberance. [Latin mamilla, mammilla, diminutive of mamma, breast; see mā-2 in the Appendix of Indo-European roots.] mammil·lar′y (mămə-lĕr′ē) adj. |
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