Where does “tyhjösäiliö” come from?

tyhjösäiliö (Finnish) comes from Finnish tyhjö, from Finnish tyhjä, from Proto-Finnic tühjä, from Proto-Balto-Slavic tuskjas, from Proto-Indo-European tews-, from Proto-Indo-European tu- — to swell; bird-cry, shriek.

Ancestry of “tyhjösäiliö”, step by step

tyhjösäiliö traces back through two separate lines of ancestry.

via Finnish tyhjö

StepLanguageWordMeaning
1Finnishtyhjö—
2Finnishtyhjäempty; blank; void
3Proto-Finnictühjäempty
4Proto-Balto-Slavictuskjasempty
5Proto-Indo-Europeantews-to be empty; to drain; to be happy
6Proto-Indo-Europeantu-to swell; bird-cry, shriek

via Finnish säiliö

StepLanguageWordMeaning
1Finnishsäiliövessel, container, tank, cistern
2Finnish-iöFront vowel variant of -io
3Spanish-ijoindicating a diminutive or despective quality
4Proto-Bantuì-Class 5 noun prefix
Every word from Proto-Indo-European tu- →Every word from Proto-Indo-European tews- →Every word from Proto-Balto-Slavic tuskjas →