The Collaborative International Dictionary of English v.0.48:

Morosoph \Mo"ro*soph\, n. [Gr. mo^ros foolish + sofo`s wise. See
   also sophomore.]
   A philosophical or learned fool. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

morosoph
    n 1: a learned fool