Source : Webster's Revised Unabridged Dictionary (1913)

Mastodynia \Mas`to*dyn"i*a\, Mastodyny \Mas*tod"y*ny\, n. [NL.
   mastodynia, fr. Gr. ? the breast + ? pain.] (Med.)
   Pain occuring in the mamma or female breast, -- a form of
   neuralgia.