Where does “eestinkielinen” come from?

eestinkielinen (Finnish) comes from Finnish kieli, from Proto-Finnic keeli, from Proto-Uralic käle — tongue; language.

Ancestry of “eestinkielinen”, step by step

eestinkielinen traces back through two separate lines of ancestry.

via Finnish kieli

StepLanguageWordMeaning
1Finnishkielitongue; language; string
2Proto-Finnickeelitongue; language
3Proto-Uralickäletongue; language

via Finnish eesti

StepLanguageWordMeaning
1FinnisheestiSynonym of viro
2EstonianeestiEstonian
Every word from Proto-Uralic käle →Every word from Proto-Finnic keeli →Every word from Finnish kieli →
eestinkielinen — Etymology, Origin & Word History | Etymology Explorer