Where does “nostalgia” come from?

nostalgia (New Latin) comes from Ancient Greek νόστος, from Ancient Greek -τος, from Proto-Indo-European -tós — Creates verbal adjectives from verb stems.

Ancestry of “nostalgia”, step by step

nostalgia traces back through two separate lines of ancestry.

via Ancient Greek νόστος

Step	Language	Word	Meaning
1	Ancient Greek	νόστος	the act of reaching a place: journey, arrival;...
2	Ancient Greek	-τος	Creates perfective passive verbal adjectives;...
3	Proto-Indo-European	-tós	Creates verbal adjectives from verb stems

via Ancient Greek ἄλγος

Step	Language	Word	Meaning
1	Ancient Greek	ἄλγος	pain (of either mind or body), sorrow, trouble, grief, distress, woe
2	Ancient Greek	ἀλέγω	I heed, trouble myself

Words derived from “nostalgia”

Every word from Proto-Indo-European -tós →Every word from Ancient Greek -τος →Every word from Ancient Greek νόστος →