Where does “altistaminen” come from?

altistaminen (Finnish) comes from Finnish altistaa, from Finnish altis, from Proto-Germanic aldaz, from Proto-Indo-European h₂eltós, from Proto-Indo-European h₂él- — to grow, nourish.

Ancestry of “altistaminen”, step by step

Step	Language	Word	Meaning
1	Finnish	altistaa	To expose; To endanger; To predispose
2	Finnish	altis	exposed, endangered, vulnerable; ready, inclined,...
3	Proto-Germanic	aldaz	old, grown up
4	Proto-Indo-European	h₂eltós	—
5	Proto-Indo-European	h₂él-	to grow, nourish

Every word from Proto-Indo-European h₂él- →Every word from Proto-Indo-European h₂eltós →Every word from Proto-Germanic aldaz →