The soft light from the moon that illuminates the Earth at night.
From Old English 'mona leoht,' combining 'mona' (moon) and 'leoht' (light). This is a straightforward descriptive compound that's been used since medieval times.
Moonlight is actually just reflected sunlight—but for thousands of years before we understood that, humans created mythology and romance around this mysterious glow, showing how not understanding something can be more beautiful than knowing!
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