lateralist

If 'left-winger' and 'right-winger' are terms of opprobrium moreover, the journalists can help their chosen cause by invoking lateralist terms to characterise, in the guise of simply describing, one of the parties in a dispute. This implies that the other party is 'centrist' or 'moderate' or 'non-extremist.'

...but as far as African bedded deposits are concerned I think that the prospector following either the “ lateralist " or " profundist " advice will waste much time and money unless he is also guided by a study of possible sources of the ore he seeks, and of the probable itenerary of the solutions to which such ore owes its present position.