n. pl. per·i·os·te·a (-tē-ə)
The dense fibrous membrane covering the surface of bones except at the joints and serving as an attachment for muscles and tendons.
[New Latin, from Late Latin periosteon, from Greek, from periosteos, around the bone : peri-, peri- + osteon, bone; see ost- in the Appendix of Indo-European roots.]
per′i·oste·al (-tē-əl), per′i·oste·ous (-tē-əs) adj.
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.