tetramastia

tet·ra·mas·ti·a

(tet-ră-mas'tē-ă),
Presence of four breasts on a person.
[tetra- + G. mastos, breast]

tetramastia

, tetramazia (tĕt″ră-măs′tē-ă) (tĕt″ră-mā′zē-ă) [″ + mastos, mazos, breast]
A condition characterized by the presence of four breasts.