Periosteum
/ˌpɛr.iˈɒs.ti.əm/noun
The dense layer of vascular connective tissue that covers most bones except at the joints.
Did you know?Periosteum comes from Greek medical language, where peri- means “around” and osteon means “bone,” a reminder that anatomy was once described with the same precision as sacred geometry.
Etymological Timeline
Ancient Greek
Greek
periosteon
“the membrane surrounding a bone”
Late Greek
Greek
periosteon
“the bone-covering membrane used in medical writing”
Late Latin
Latin
periosteum
“the membrane around a bone”
Middle English
English
perioste
“the membrane covering a bone”
Modern English
English
periosteum
“the connective tissue layer covering most bones”
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