DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   pallium
       n 1: the layer of unmyelinated neurons (the grey matter) forming
            the cortex of the cerebrum [syn: cerebral cortex,
            cerebral mantle, pallium, cortex]
       2: (zoology) a protective layer of epidermis in mollusks or
          brachiopods that secretes a substance forming the shell [syn:
          mantle, pallium]
       3: (Roman Catholic Church) vestment consisting of a band
          encircling the shoulders with two lappets hanging in front
          and back
       4: cloak or mantle worn by men in ancient Rome