Main Entry: peri·os·te·um

Pronunciation: \-tē-əm\

Function: noun

Inflected Form(s): plural -tea\-tē-ə\

Etymology: New Latin, from Late Latin periosteon, from Greek, neuter of periosteos around the bone, from peri- + osteon bone — more at osseous

Date: 1597

: the membrane of connective tissue that closely invests all bones except at the articular surfaces