Heat injury or damage caused by prolonged or excessive exposure to sunlight, similar to sunstroke or heat exhaustion.
From Greek 'helios' (sun) plus medical suffix '-osis' (condition or disease), literally describing a sun-caused condition.
Heliosis is basically what happens when your body can't cope with intense sun exposure—it's a real medical condition that heat-workers and outdoor athletes have to prevent by staying hydrated and cooling down!
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