Where does “tantissimo” come from?

tantissimo (Italian) comes from Italian tanto, from Latin tantus, from Latin tam, from Proto-Indo-European téh₂m, from Proto-Indo-European séh₂, from Proto-Indo-European só — this; that.

Ancestry of “tantissimo”, step by step

StepLanguageWordMeaning
1Italiantantoso much, so many; much, many; such
2Latintantusof such size, of such measure; so much, so great
3Latintamso, so much, to such an extent, to such a degree
4Proto-Indo-Europeantéh₂m—
5Proto-Indo-Europeanséh₂—
6Proto-Indo-Europeansóthis; that
Every word from Proto-Indo-European só →Every word from Proto-Indo-European séh₂ →Every word from Proto-Indo-European téh₂m →