A heretic; non-Buddhist. To miss， mistake or be off the true way. A follower of mistaken theories. （1） In Indian Buddhism， other religious teachings than Buddhism， or their followers. For example: The 'six masters of the outside way' （liushiwaidao 六师外道）， and the '95 Kinds of Outside Teaching' （jiushiwuzhongwaidao 九十五种外道）， etc. （2） A debater or argumentative person; a dialectician.