Where does “eider” come from?

eider (Old French) comes from Latin adiūtō, from Latin -tō, from Latin -tus, from Proto-Italic -tus, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Ancestry of “eider”, step by step

StepLanguageWordMeaning
1Latinadiūtōto help, serve, assist
2Latin-tōForms here
3Latin-tusForms the past participle of verbs; Forms...
4Proto-Italic-tus—
5Proto-Indo-European-tusDerives action nouns from verb roots

Words derived from “eider”

Every word from Proto-Indo-European -tus →Every word from Latin -tus →Every word from Latin -tō →