pallium in WordNet English dictionary

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