The Collaborative International Dictionary
Osteocranium
Osteocranium \Os`te*o*cra"ni*um\, n. [Osteo- + cranium.] (Anat.) The bony cranium, as distinguished from the cartilaginous cranium.
Wiktionary
osteocranium
n. (context anatomy English) The bony cranium, as distinguished from the cartilaginous cranium.