rārō adv.with comp.
rarus, seldom, rarely, now and then : id, quod raro fit: evenire: vinum aegrotis prodest raro: Raro antecedentem scelestum Deseruit poena, H.: si rarius fiet, quam, etc.
rārō, adv., v. rarus fin. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.