Where does “selkäpiiluu” come from?

selkäpiiluu (Ingrian) comes from Ingrian selkä, from Proto-Finnic selkä, from Proto-Finno-Permic śelkä.

Ancestry of “selkäpiiluu”, step by step

selkäpiiluu traces back through two separate lines of ancestry.

via Ingrian selkä

StepLanguageWordMeaning
1Ingrianselkäback
2Proto-Finnicselkäback; ridge
3Proto-Finno-Permicśelkä—

via Ingrian piiluu

StepLanguageWordMeaning
1Ingrianpiiluuvertebra
2Ingrianluubone
3Proto-Finno-Ugric*luu—
Every word from Proto-Finno-Permic śelkä →Every word from Proto-Finnic selkä →Every word from Ingrian selkä →