Where does “pienissimo” come from?

pienissimo (Italian) comes from Italian pieno, from Latin plēnus, from Proto-Italic plēnos, from Proto-Indo-European pl̥h₁nós, from Proto-Indo-European pleh₁- — to fill.

Ancestry of “pienissimo”, step by step

StepLanguageWordMeaning
1Italianpienofull
2Latinplēnusfull; filled; complete
3Proto-Italicplēnosfull
4Proto-Indo-Europeanpl̥h₁nósfull
5Proto-Indo-Europeanpleh₁-to fill
Every word from Proto-Indo-European pleh₁- →Every word from Proto-Indo-European pl̥h₁nós →Every word from Proto-Italic plēnos →