‖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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.