Where does “ad nauseam” come from?

ad nauseam (Latin) comes from Latin nauseam, from Latin nausea, from Ancient Greek ναυσία, from Ancient Greek ναῦς, from Proto-Indo-European néh₂us, from Proto-Indo-European (s)neh₂- — to swim; to float.

Ancestry of “ad nauseam”, step by step

ad nauseam traces back through two separate lines of ancestry.

via Latin nauseam

Step	Language	Word	Meaning
1	Latin	nauseam	accusative singular of nausea; sea-sickness,...
2	Latin	nausea	nausea; seasickness; second-person singular...
3	Ancient Greek	ναυσία	nausea, seasickness
4	Ancient Greek	ναῦς	a ship
5	Proto-Indo-European	néh₂us	boat
6	Proto-Indo-European	(s)neh₂-	to swim; to float

via Latin ad

Step	Language	Word	Meaning
1	Latin	ad	toward, to; up to; near, by, close by, at, to
2	Proto-Italic	ad	toward, to, on, up to, for
3	Proto-Indo-European	h₂éd	to, at

Words derived from “ad nauseam”

Every word from Proto-Indo-European (s)neh₂- →Every word from Proto-Indo-European néh₂us →Every word from Ancient Greek ναῦς →