Another name for Vitamin A, a nutrient essential for vision, skin health, and immune function in the human body.
From Greek 'axer' (dry) + 'ophthal' (eye), literally 'dry eye.' Named because Vitamin A deficiency causes dry eyes. The term is largely obsolete.
Doctors literally named Vitamin A after its most dramatic symptom—if you don't get enough, your eyes literally dry out and you go blind!
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