Used in biology or medicine to refer to the bony structure of the head. The surgeon studied the cranium to prepare for the operation.
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Not Casual
More formal and scientific than 'head' or 'skull'; not used in everyday conversation. In the anatomy class, we learned about the different bones in the cranium.
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Protection Association
Often linked with safety and protecting the brain, like in sports or constructions. Cyclists wear helmets to safeguard their cranium from injuries.