Where does “kaistaleveys” come from?

kaistaleveys (Finnish) comes from Finnish leveys, from Finnish leveä, from Proto-Finnic levedä — wide.

Ancestry of “kaistaleveys”, step by step

kaistaleveys traces back through two separate lines of ancestry.

via Finnish leveys

StepLanguageWordMeaning
1Finnishleveyswidth or breadth of an object; beam; "in...
2Finnishleveäwide
3Proto-Finniclevedäwide

via Finnish kaista

StepLanguageWordMeaning
1Finnishkaistalane; band; shred, strip
2Proto-Norsegaistō(n)-—
Every word from Proto-Finnic levedä →Every word from Finnish leveä →Every word from Finnish leveys →