1The nipple of a woman's breast.
- ‘Papillomavirus DNA was present in 25 of 29 samples of breast carcinoma and in 20 of 29 samples from the corresponding mamilla.’
- 1.1The corresponding organ in any mammal.
- 1.2A nipple-shaped structure.
Late 17th century: from Latin, diminutive of mamma breast (see mamma).