In anatomy, relating to the internal portion of the carotid artery.
From Greek 'entos' (within) plus 'carotid' (from Greek 'karotides,' the arteries in the neck thought to carry sleep-inducing substances). The suffix '-id' indicates it's an anatomical structure.
The ancient Greeks named the carotid arteries because they thought pressing on them caused sleep—they had the function wrong, but the name stuck! Adding 'ento-' let doctors specify which part of this vital neck artery they meant.
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