Lewis Short
Sēmo (noun M) : probably from sēmen
* An ancient god that presided over the crops: SEMVNIS ALTERNEI ADVOCAPIT CONCTOS, song of the Fratres Arvales,Inscr. Orell. 2270.—As an epithet of Sancus, Ov. F. 6, 214; Liv. 8, 20; Inscr. Orell. 1860; 6999.
Charlton T. Lewis, Charles Short, A Latin Dictionary