Where does “φροντιστήριον” come from?

φροντιστήριον (Ancient Greek) comes from Ancient Greek φροντιστής, from Ancient Greek φρονέω, from Ancient Greek -έω, from Proto-Indo-European -éyeti, from Proto-Indo-European -yeti — Creates transitive imperfective verbs from roots.

Ancestry of “φροντιστήριον”, step by step

StepLanguageWordMeaning
1Ancient Greekφροντιστήςa thinker
2Ancient Greekφρονέωto think, to have understanding, to be wise,...
3Ancient Greek-έωUsed to form verbs from nouns, adjectives and...
4Proto-Indo-European-éyetiForms causative imperfective verbs from roots;...
5Proto-Indo-European-yetiCreates transitive imperfective verbs from roots
Every word from Proto-Indo-European -yetiEvery word from Ancient Greek -έωEvery word from Proto-Indo-European -éyeti