LAT

Lewis Short

(verb) : sŏrōrĭo, āre, soror, of the female breasts
* To grow up or swell together, like two sisters: papillae sororiabant, Plaut. Fragm. ap. Fest. p. 297 Müll.: mammae sororiantes,Plin. 31, 6, 33, § 66.
Charlton T. Lewis, Charles Short, A Latin Dictionary
memory