pallium

(noun) the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum. Synonyms: cerebral cortex, cerebral mantle, cortex.

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

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

(noun) cloak or mantle worn by men in ancient Rome.