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[per-ee-os-tee-uh m] /ˌpɛr iˈɒs ti əm/
noun, plural periostea
[per-ee-os-tee-uh] /ˌpɛr iˈɒs ti ə/ (Show IPA).
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.
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-
Related forms
periosteal, periosteous, adjective
periosteally, adverb
subperiosteal, adjective
subperiosteally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for periosteum


noun (pl) -tea (-tɪə)
a thick fibrous two-layered membrane covering the surface of bones
Derived Forms
periosteal, adjective
Word Origin
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
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Word Origin and History for periosteum

1590s, from Modern Latin periosteum, Late Latin periosteon, from Greek periosteon, neuter of periosteos "round the bones," from peri- (see peri-) + osteon (see osseous).

Online Etymology Dictionary, © 2010 Douglas Harper
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periosteum in Medicine

periosteum per·i·os·te·um (pěr'ē-ŏs'tē-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.

per'i·os'te·al (-tē-əl) or per'i·os'te·ous (-tē-əs) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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