Definition of cranium noun from the Oxford Advanced American Dictionary

 

cranium

 noun
noun
NAmE//ˈkreɪniəm//
 
(pl. craniums, (or )crania
NAmE//ˈkreɪniə//
 
)
(anatomy)
 
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the bone structure that forms the head and surrounds and protects the brain synonym skull
NAmE//ˈkreɪniəl//
 
adjective [only before noun] cranial nerves/injuries
See the Oxford Advanced Learner's Dictionary entry: cranium