Lewis Short
explānātor (noun M) : id.
* An explainer, interpreter: sunt enim explanatores, ut grammatici poëtarum,Cic. Div. 1, 51, 116: explanator aut interpres ejus legis, Lact. (Cic. ap. Lact.?) 6, 8.
Charlton T. Lewis, Charles Short, A Latin Dictionary