Where does “cytus” come from?

cytus (Latin) comes from Ancient Greek κύτος, from Proto-Indo-European (s)kewH- — to cover, bedeck; cover.

Ancestry of “cytus”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	κύτος	a hollow; any vessel; e.g. a jar, an urn, a vase,...
2	Proto-Indo-European	(s)kewH-	to cover, bedeck; cover

cytus — Etymology, Origin & Word History | Etymology Explorer