- Pertaining to the periosteum, a dense membrane composed of fibrous connective tissue that closely wraps (invests) all bone, except the bone of articulating surfaces in joints which are covered by synovial membranes. Peri- is a prefix borrowed from the Greek meaning "around or about" and "-osteal" also comes from the Greek, from "osteon" meaning "bone" so periosteal literally pertains to around bone.
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* * *peri·os·te·al .per-ē-'äs-tē-əl adj1) situated around or produced external to bone2) of, relating to, or involving the periosteum <a \periosteal sarcoma>
Medical dictionary. 2011.