Where does “twinlessness” come from?

twinlessness (English) comes from English twinless, 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.

twinlessness (English): Absence of a twin

Definitions

  1. Absence of a twin

Ancestry of “twinlessness”, step by step

twinlessness traces back through two separate lines of ancestry.

via English twinless

StepLanguageWordMeaning
1EnglishtwinlessWithout a twin
2EnglishtwinEither of two people who shared the same uterus...
3Middle Englishtwin
4Old Englishtwīndouble thread, twist, twine, linen-thread, linen
5Proto-West Germanictwiʀntwine, double thread
6Proto-Germanictwiznazthread, twine
7Proto-Indo-Europeandwisnósdouble
8Proto-Indo-Europeandwóh₁two

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European dwóh₁