Definition of cranium noun from the Oxford Advanced Learner's Dictionary

 

cranium

 noun
noun
BrE BrE//ˈkreɪniəm//
 
; NAmE NAmE//ˈkreɪniəm//
 
(pl. craniums, crania
BrE BrE//ˈkreɪniə//
 
; NAmE NAmE//ˈkreɪniə//
 
)
(anatomy) Skeleton and muscles
 
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the bone structure that forms the head and surrounds and protects the brain synonym skull See related entries: Skeleton and muscles Word Origin late Middle English: via medieval Latin from Greek kranion ‘skull’.
See the Oxford Advanced American Dictionary entry: cranium