1. Relating to or forming the wall of a body part, organ, or cavity.
2. Of or relating to either of the parietal bones.
3. Botany Borne on the inside of the ovary wall. Used of the ovules or placentas in flowering plants.
4. Dwelling within or having authority within the walls or buildings of a college.
1. A parietal part, such as a wall or bone.
2. parietals The rules governing the visiting privileges of members of the opposite sex in college or university dormitories.
[Middle English, from Late Latin parietālis, of a wall, from Latin pariēs, pariet-, wall.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.