Where does “nontwin” come from?

nontwin (English) comes from English twin, from Middle English twin, from Old English twīn, from Proto-West Germanic twiʀn, from Proto-Germanic twiznaz, from Proto-Indo-European dwisnós, from Proto-Indo-European dwóh₁ — two.

nontwin (English): Any individual who is not a twin

Definitions

  1. Any individual who is not a twin

Ancestry of “nontwin”, step by step

nontwin traces back through two separate lines of ancestry.

via English twin

StepLanguageWordMeaning
1EnglishtwinEither of two people who shared the same uterus...
2Middle Englishtwin
3Old Englishtwīndouble thread, twist, twine, linen-thread, linen
4Proto-West Germanictwiʀntwine, double thread
5Proto-Germanictwiznazthread, twine
6Proto-Indo-Europeandwisnósdouble
7Proto-Indo-Europeandwóh₁two

via English non

StepLanguageWordMeaning
1EnglishnonObsolete form of none
2Frenchnonno; not; a no, a negative response
3Old Frenchnonno; not; Alternative form of nom
4Latinnōnnot
5Old Latinnoenum
6Proto-Indo-Europeanóynosone; single
Every word from Proto-Indo-European dwóh₁