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Why is Proto-Indo-European form for light *lewktom when Russian has satem лысина (lɨsʲɪnə) bald spot?

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    You should at least check Vasmer first. Although Derksen: The comparison with Skt. rus̀ant- ‘shining, bright’ (Vasmer s.v.) does not seem promising. A connection with *lysto ‘shin, calf ’ (Lubotsky, p.c.) is semantically feasible, cf. →*golěnъ vs. →*gòlъ.
    – Vladimir F
    Jan 13 '20 at 15:57
  • this question is really interus̀ant. Could -сина be akin to shine, *(s)ḱeh₁y-, whence PSlav *sijna or *sъjna. Compare Heiligenschein "halo".
    – vectory
    Mar 10 '20 at 15:51
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The root *l-wk- has dozens of descendants all across PIE, including Russian luč. Forms like that, Sanskrit roka, etc show clear evidence of a PIE velar *k.

I'm not an expert on Slavic, but I'd assume lysina has /s/ not from the satem shift but from some later development, possibly affected by the front vowel after it. (Alternately, it might come from a different root altogether, or be a borrowing, etc.)

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    – prash
    Jan 13 '20 at 20:12

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