Where does “interwed” come from?

interwed (English) comes from English inter, from Middle English enteren, from French entrer, from Middle French entrer, from Old French entrer, from Latin intrō, from Latin intra, from Latin interus — Contrastive or oppositional adjectival suffix.

Ancestry of “interwed”, step by step

interwed traces back through two separate lines of ancestry.

via English inter

StepLanguageWordMeaning
1EnglishinterTo bury in a grave; To confine, as in a prison
2Middle Englishenteren
3Frenchentrerto enter
4Middle Frenchentrerto enter
5Old Frenchentrerto enter
6Latinintrōto enter, go into, come in, get in, penetrate
7Latinintrawithin; inside; during; less than
8Latininterus
9Proto-Indo-Europeanh₁énterosinside, within
10Proto-Indo-European-terosContrastive or oppositional adjectival suffix

via English wed

StepLanguageWordMeaning
1EnglishwedTo perform the marriage ceremony for; to join in...
2Middle Englishweddento marry; to wed
3Old Englishweddianto pledge, to promise; to betroth; to wed, to...
4Proto-West Germanicwaddjōnto wager, to pledge
5Proto-Germanicwadjōnąto wager, to pledge
6Proto-Germanicwadjąwager, stake, pledge
7Proto-Indo-Europeanwedʰ-to bind, to secure; to pledge, to guarantee; to...
Every word from Proto-Indo-European -terosEvery word from Proto-Indo-European h₁énterosEvery word from Latin interus