Lewis Short
sōbrīnus | sōbrīna, ae (noun M.f) : m., and , , f.contr. for sororinus from soror, and therefore prop. an appellation for the children of sisters; hence, in gen.
* A cousin-german, cousin by the mother's side, Fest. p. 297 Müll.; Dig. 38, 10, 3; Just. Inst. 3, 6.
* Masc., Ter. And. 4, 5, 6; id. Phorm. 2, 3, 37; Cic. Off. 1, 17, 54; Dig. 38, 10, 1; 38, 10, 10.
* Fem., Plaut. Poen. 5, 2, 108; Tac. A. 12, 6 and 64; Dig. 38, 10, 10.
Charlton T. Lewis, Charles Short, A Latin Dictionary