[ per-ee-os-tee-uhm ]
/ ˌpɛr iˈɒs ti əm /
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noun, plural per·i·os·te·a [per-ee-os-tee-uh]. /ˌpɛr iˈɒs ti ə/. Anatomy.

the normal investment of bone, consisting of a dense, fibrous outer layer, to which muscles attach, and a more delicate, inner layer capable of forming bone.



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Origin of periosteum

1590–1600; <New Latin, variant of Late Latin periosteon, noun use of neuter of Greek periósteos around the bones. See peri-, osteo-


per·i·os·te·al, per·i·os·te·ous, adjectiveper·i·os·te·al·ly, adverbsub·per·i·os·te·al, adjectivesub·per·i·os·te·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for periosteum

British Dictionary definitions for periosteum

/ (ˌpɛrɪˈɒstɪəm) /

noun plural -tea (-tɪə)

a thick fibrous two-layered membrane covering the surface of bones

Derived forms of periosteum

periosteal, adjective

Word Origin for periosteum

C16: New Latin, from Greek periosteon, from peri- + osteon bone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for periosteum

[ pĕr′ē-ŏstē-əm ]

n. pl. per•i•os•te•a (-tē-ə)

The thick fibrous membrane covering the entire surface of a bone except its articular cartilage and serving as an attachment for muscles and tendons.

Other words from periosteum

per′i•oste•al (-tē-əl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.