Relating to the inner surface or interior of the skull.
From Greek 'entos' (within) + Latin 'cranium' (skull). The term combines the prefix meaning 'inside' with the anatomical term for the brain's protective bone case.
This word belongs to a whole family of anatomical terms starting with 'ento-' that describe internal structures—they're like a secret language doctors use to pinpoint exactly where inside the body they're talking about.
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