'Sun' is PIE *suh-en- — possibly from *sewH- (to give birth), casting the sun as 'the one who gives birth' to light.
The star at the center of the solar system, around which the earth and other planets revolve; a source of light and warmth.
From Old English 'sunne,' from Proto-Germanic *sunnōn, from PIE *suh₂en- or *sh₂wen- (the sun). This is one of the oldest reconstructable words in Indo-European, with cognates in nearly every branch: Latin 'sōl,' Greek 'hēlios,' Sanskrit 'sūrya,' Welsh 'haul,' Lithuanian 'sáulė,' and Old Church Slavonic 'slŭnĭce.' The PIE word was likely derived from the root *sewH- (to give birth), making the sun literally 'the one who gives birth' — to light, warmth, and the day. Key
English 'sun' and Latin 'sōl' (source of 'solar') are cognates from the same PIE root, but they descend from two different PIE formations — 'sun' from the n-stem *suh₂en- and 'solar' from the l-stem *sóh₂wl̥ — meaning English inherited the sun-word twice through different channels.
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