Definition of "Pallium" :

noun: cloak or mantle worn by men in ancient Rome

noun: (Roman Catholic Church) vestment consisting of a band encircling the shoulders with two lappets hanging in front and back

noun: (zoology) a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell

noun: the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum