Where does “teräsin” come from?

teräsin (Finnish) comes from Finnish -sin, from Finnish -in, from Proto-Finno-Ugric *-in, from Proto-Uralic -ma.

Ancestry of “teräsin”, step by step

StepLanguageWordMeaning
1Finnish-sinForms certain nouns, particularly those...
2Finnish-inSuffix variant for the illative singular, see...
3Proto-Finno-Ugric*-in—
4Proto-Uralic-ma—
Every word from Proto-Uralic -ma →Every word from Finnish -in →Every word from Finnish -sin →
teräsin — Etymology, Origin & Word History | Etymology Explorer