Literally meaning: “around the bone”
Origin: Anc Greek
περί-/peri- (=combining form meaning “around”)
+ οστέον/osteoν(=bone) > ο (accumulate) + ίστημι/istimi(stand)
+-um=latin suffix that forms singular nouns
Periosteum is a membrane that lines the outer surface of all bones, except at the joints of long bones.