Plural of cranium; the plural form referring to multiple skulls or the bone structures that encase the brain.
From Latin 'cranium,' derived from Greek 'kranion' (skull). In medical and anatomical contexts, the plural 'crannia' maintains the Latin form, though 'craniums' is also used in English.
The word 'cranium' comes from the same root as 'crane' the bird—ancient doctors noticed that the curved top of the skull resembles a crane's head, so they borrowed the name!
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