n. pl. pal·li·ums or pal·li·a (pălē-ə)
1. A cloak or mantle worn by the ancient Greeks and Romans.
2. Ecclesiastical A vestment worn by the pope and conferred by him on archbishops. Also called pall1.
a. The mantle of gray matter forming the cerebral cortex.
b. The mantle of a mollusk or a brachiopod.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.