PERIOSTEUM

periosteum. Periosteum, n. a membrane covering the bones

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‖Per′i‐os″te‐um (?), n. [[NL., fr. Gr. περιόστεοσ round the bones; περί around + οστἔον a bone: cf. L. periosteon.]] (Anat.) The membrane of fibrous connective tissue which closely invests all bones except at the articular surfaces.