Where does “vastakkaisvirtaus” come from?

vastakkaisvirtaus (Finnish) comes from Finnish vastakkainen, from Finnish vastakkain, from Finnish vasta-, from Finnish vasta, from Swedish kvast, from Old Swedish quaster, from Old Norse kvǫstr, from Proto-Germanic kwastuz — twig; leafwork.

Ancestry of “vastakkaisvirtaus”, step by step

vastakkaisvirtaus traces back through two separate lines of ancestry.

via Finnish vastakkainen

StepLanguageWordMeaning
1Finnishvastakkainenopposite, contrary; inverse
2Finnishvastakkainagainst; face to face, vis-à-vis
3Finnishvasta-Expressing opposition or contrast: counter-,...
4FinnishvastaExpressing delay or that something takes place...
5Swedishkvastbroom; tassel; cyme
6Old Swedishquaster
7Old Norsekvǫstr
8Proto-Germanickwastuztuft; tassel
9Proto-Indo-Europeangʷes-twig; leafwork

via Finnish virtaus

StepLanguageWordMeaning
1Finnishvirtauscurrent
2Finnishvirratato flow, stream
3Finnish-taA suffix for the partitive singular case; Forms...
4Proto-Finnic-taPartitive ending
5Proto-Uralic-täfrom
Every word from Proto-Indo-European gʷes-Every word from Finnish vasta-Every word from Proto-Germanic kwastuz