Where does “sessico” come from?

sessico (Vulgar Latin) comes from Latin sessus, from Latin -tus, from Proto-Italic -tus, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Ancestry of “sessico”, step by step

StepLanguageWordMeaning
1Latinsessusa sitting
2Latin-tusForms the past participle of verbs; Forms...
3Proto-Italic-tus—
4Proto-Indo-European-tusDerives action nouns from verb roots
Every word from Proto-Indo-European -tus →Every word from Latin -tus →Every word from Latin sessus →