Merriam-Webster Collegiate Dictionary - pallium

 noun  (plural pallia or -liums)  Etymology: Middle English, from Latin  Date: 12th century  1.  a. a white woolen band with pendants in front and back worn over the chasuble by a pope or archbishop as a symbol of full episcopal authority  b. a draped rectangular cloth worn as a cloak by men of ancient Greece and Rome  2. New Latin, from Latin, cloak  a. cerebral cortex  b.  (1) the mantle of a mollusk or brachiopod  (2) the mantle of a bird