Meanings of supernumerary breasts in English

Saunois details an account of a female who had two supernumerary breasts on the back.

Julia, the mother of Alexander Severus, was surnamed "Mammea" because she had supernumerary breasts.

This authority also mentions that the French call husbands who have well-developed mammae "la couvade;" the Germans call male supernumerary breasts "bauchwarze," or ventral nipples.

Hirst says: Supernumerary breasts and nipples are more common than is generally supposed.