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Definition of: periosteum
(per′ē·os′tē·əm) noun Anat.
A tough, fibrous, two–layered vascular membrane that surrounds and nourishes the bones. [<NL <L periosteon <Gk., neut. of periosteos around the bones <peri- around + osteon a bone]
—per′i·os′te·al, per′i·os′te·ous adjective
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