Plural of sun; either multiple star systems with planets orbiting them, or poetic/figurative references to things that shine brightly like our Sun.
From Old English 'sunne,' derived from Proto-Germanic 'sunno,' which is related to Sanskrit 'surya.' The word is ancient and appears in nearly all Indo-European languages with similar forms.
The word 'sun' is so ancient it appears in nearly identical forms across languages from India to Ireland—'surya' in Sanskrit, 'sonne' in German, 'soleil' in French—showing how our ancestors all stared at the same star and gave it similar names!
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