Where does “światłoszczelny” come from?

światłoszczelny (Polish) comes from Polish światło, from Old Polish światły, from Proto-Slavic světьlъ, from Proto-Slavic světъ, from Proto-Balto-Slavic śwaitas, from Proto-Indo-European ḱweyt- — to shine.

światłoszczelny (Polish): lightproof, lighttight

Definitions

  1. lightproof, lighttight

Ancestry of “światłoszczelny”, step by step

światłoszczelny traces back through two separate lines of ancestry.

via Polish światło

StepLanguageWordMeaning
1Polishświatłolight
2Old Polishświatły—
3Proto-Slavicsvětьlъbright
4Proto-Slavicsvětъlight; world
5Proto-Balto-Slavicśwaitas—
6Proto-Indo-Europeanḱweyt-to shine

via Polish szczelny

StepLanguageWordMeaning
1Polishszczelnytight, hermetic
2Proto-Slavicščelьfracture, crack, fissure
Every word from Proto-Indo-European ḱweyt- →Every word from Proto-Balto-Slavic śwaitas →Every word from Proto-Slavic světъ →