Lewis Short
lūdīmăgister | lūdī măgister (noun M) : (better separately, ), , ludus-magister
* A school-master, school-teacher: cum agellus eum non satis aleret, ut opinor, ludi magister fuit,Cic. N. D. 1, 26, 72: Dionysius ludimagistrum professus pueros in trivio docebat,Just. 21, 5, 8; Mart. 10, 62, 1.
Charlton T. Lewis, Charles Short, A Latin Dictionary