per·i·os·te·um 
(pĕr′ē-ŏstē-əm)
(pĕr′ē-ŏstē-əm)n. pl. per·i·os·te·a (-tē-ə)
The dense fibrous membrane covering the surface of bones except at the joints and serving as an attachment for muscles and tendons.
[New Latin, from Late Latin periosteon, from Greek, from periosteos, around the bone : peri-, peri- + osteon, bone; see ost- in the Appendix of Indo-European roots.]
per′i·oste·al (-tē-əl), per′i·oste·ous (-tē-əs) adj.