PyrrhonismPronunciation: /ˈpɪrənɪz(ə)m/Definition of Pyrrhonism noun [mass noun] the philosophy of Pyrrho. philosophic doubt; scepticism: the numbing Pyrrhonism of deconstructionismDerivatives Pyrrhonist noun & adjective Pyrrhonism in other Oxford dictionaries Definition of Pyrrhonism in the US English dictionary