Where does “gratissimo” come from?

gratissimo (Italian) comes from Italian grato, from Latin grātus, from Proto-Italic grātos, from Proto-Indo-European gʷr̥Htós, from Proto-Indo-European gʷerH- — to express approval; praise; to elevate.

Ancestry of “gratissimo”, step by step

StepLanguageWordMeaning
1Italiangratoappreciated, welcome; pleasant; grateful
2Latingrātuspleasing, acceptable, agreeable, welcome
3Proto-Italicgrātos—
4Proto-Indo-Europeangʷr̥Htóspraised
5Proto-Indo-EuropeangʷerH-to express approval; praise; to elevate
Every word from Proto-Indo-European gʷerH- →Every word from Proto-Indo-European gʷr̥Htós →Every word from Proto-Italic grātos →