Where does “polttoväli” come from?

polttoväli (Finnish) comes from Finnish poltto, from Finnish polttaa, from Proto-Finnic polttadak, from Proto-Finnic paladak, from Proto-Uralic pala- — to devour, eat.

polttoväli (Finnish): focal length

Definitions

focal length

Ancestry of “polttoväli”, step by step

polttoväli traces back through two separate lines of ancestry.

via Finnish poltto

Step	Language	Word	Meaning
1	Finnish	poltto	burn, burning; burn; incineration
2	Finnish	polttaa	to burn; to burn, sunburn; to burn, waste
3	Proto-Finnic	polttadak	to burn
4	Proto-Finnic	paladak	to burn, to be burning
5	Proto-Uralic	pala-	to devour, eat

via Finnish väli

Step	Language	Word	Meaning
1	Finnish	väli	gap, space; interval; distance
2	Proto-Finnic	välji	—

Every word from Proto-Uralic pala- →Every word from Proto-Finnic paladak →Every word from Proto-Finnic polttadak →