Explanâtor, pen. prod. tôris, m. g. Cicer.A declarer: expounder, or interpretour.
Lewis and Short: Latin dictionary
explānātor, ōris, 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.