Where does “raudfuru” come from?

raudfuru (Norwegian Nynorsk) comes from Norwegian Nynorsk raud, from Old Norse rauðr, from Old English dūn, from Proto-Germanic *dūnā, from Proto-Celtic dūnom, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

raudfuru (Norwegian Nynorsk): red pine (Pinus resinosa)

Definitions

red pine (Pinus resinosa)

Ancestry of “raudfuru”, step by step

raudfuru traces back through two separate lines of ancestry.

via Norwegian Nynorsk raud

Step	Language	Word	Meaning
1	Norwegian Nynorsk	raud	having the colour red; socialist, communist
2	Old Norse	rauðr	red
3	Old English	dūn	hill, down; hill, dune; hill, mountain
4	Proto-Germanic	*dūnā	—
5	Proto-Celtic	dūnom	stronghold, rampart
6	Proto-Indo-European	dʰewh₂-	smoke; mist, haze

via Norwegian Nynorsk furu

Step	Language	Word	Meaning
1	Norwegian Nynorsk	furu	a pine; pine
2	Old Norse	fura	fir, firtree; pine
3	Proto-Germanic	furhō	fir; pine; forest
4	Proto-Indo-European	pérkus	oak
5	Proto-Indo-European	perkʷ-	oak

Every word from Proto-Indo-European dʰewh₂- →Every word from Proto-Celtic dūnom →Every word from Proto-Germanic *dūnā →