Lewis Short
mŏdimpĕrātor (noun M) : for modi imperator
* The president or chairman of a convivial party, who prescribes the quantity to be drunk (the magister bibendi, the Greek συμποσίαρχος): potandi modimperatores, Varr. ap. Non. 142, 7.
Charlton T. Lewis, Charles Short, A Latin Dictionary