Where does “dormitaturus” come from?

dormitaturus (Latin) comes from Latin dormito, from Latin -tō, from Latin -tus, from Proto-Italic -tus, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Definitions

Ancestry of “dormitaturus”, step by step

StepLanguageWordMeaning
1LatindormitoI slumber; I feel sleepy, drowsy; I do nothing;...
2Latin-tōForms here
3Latin-tusForms the past participle of verbs; Forms...
4Proto-Italic-tus—
5Proto-Indo-European-tusDerives action nouns from verb roots
Every word from Proto-Indo-European -tus →Every word from Latin -tus →Every word from Latin -tō →