Plural of carotid; the two major arteries on either side of the neck that deliver blood to the brain and head.
From Greek karotis (artery), from karos (sleep), because pressure on these arteries causes unconsciousness. Singular form 'carotid' established in medieval anatomy.
Your carotids are your brain's lifeline—they're so important that a temporary pinch causes syncope (fainting), which is why boxers and martial artists study their location.
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