Where does “twi-” come from?

twi- (Middle English) comes from Old English twī-, from Proto-Germanic twī-, from Proto-Indo-European dwi-, from Proto-Indo-European dwóh₁ — two.

Ancestry of “twi-”, step by step

StepLanguageWordMeaning
1Old Englishtwī-two, double; double
2Proto-Germanictwī-two-, double-
3Proto-Indo-Europeandwi-two; apart, asunder
4Proto-Indo-Europeandwóh₁two

Words derived from “twi-”

Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Indo-European dwi- →Every word from Old English twī- →