Where does “tve-” come from?

tve- (Swedish) comes from Old Norse [[tve-]], [[tví-]], from Proto-Germanic [[*twi-]], [[*twī-]].

tve- (Swedish): bi-, di-, duo-

Definitions

Step	Language	Word	Meaning
1	Old Norse	[[tve-]], [[tví-]]	—
2	Proto-Germanic	[[twi-]], [[twī-]]	—

tve- — Etymology, Origin & Word History | Etymology Explorer