Where does “käyräviivain” come from?

käyräviivain (Finnish) comes from Finnish käyrä, from Proto-Finnic käkrä, from Proto-Germanic hagrō.

käyräviivain (Finnish): A spline flexible strip of metal or other material, that may be bent into a curve and used to draw smooth curves between points

Definitions

A spline flexible strip of metal or other material, that may be bent into a curve and used to draw smooth curves between points

Ancestry of “käyräviivain”, step by step

käyräviivain traces back through two separate lines of ancestry.

via Finnish käyrä

Step	Language	Word	Meaning
1	Finnish	käyrä	crooked; curve; plot, graph, diagram
2	Proto-Finnic	käkrä	bent, crooked
3	Proto-Germanic	hagrō	—

via Finnish viivain

Step	Language	Word	Meaning
1	Finnish	viivain	A ruler; A straightedge; Genitive plural form...
2	Finnish	viiva	line; dash, hyphen; bar
3	Finnish	vije-	—

Every word from Proto-Germanic hagrō →