Definition of cranium
: skull specifically : the part of the skull that encloses the brain : braincase Among the physical characters that distinguish them from other early humans are the long, low sweep of the Neanderthal cranium … — James Shreeve "Hey, big head!" Mahorn shouted. Aguirre does, in fact, have an extraordinary cranium.— Jeff Coplon You don't "watch" a film like Fight Club; you mainline a deluge of visual and sonic information (including a hefty chunk of the IKEA catalog) straight into your cranium. — Jeff Gordinier
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Time Traveler for cranium
The first known use of cranium was in the 15th century
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