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periosteum (n.)

"the enveloping membrane of the bones," 1590s, from Modern Latin periosteum, Late Latin periosteon, from Greek periosteon, neuter of periosteos "round the bones," from peri "around, about" (see peri-) + osteon "bone" (from PIE root *ost- "bone"). Related: Periosteal.

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Definitions of periosteum

periosteum (n.)
a dense fibrous membrane covering the surface of bones (except at their extremities) and serving as an attachment for tendons and muscles; contains nerves and blood vessels that nourish the enclosed bone;
From wordnet.princeton.edu