Where does “космона́вт” come from?

космона́вт (Russian) comes from Ancient Greek ναύτης, from Ancient Greek -τής, from Ancient Greek πεῖρα, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

космона́вт (Russian): cosmonaut (the Russian or Soviet equivalent of an astronaut)

Definitions

cosmonaut (the Russian or Soviet equivalent of an astronaut)

Ancestry of “космона́вт”, step by step

космона́вт traces back through two separate lines of ancestry.

via Ancient Greek ναύτης

Step	Language	Word	Meaning
1	Ancient Greek	ναύτης	sailor, seaman; companion at sea
2	Ancient Greek	-τής	Appended to verbs to form agent nouns
3	Ancient Greek	πεῖρα	trial, experiment, attempt
4	Proto-Indo-European	per-	before, in front; first; to go through
5	Proto-Indo-European	pr̥tós	passed , crossed

via Ancient Greek κόσμος

Step	Language	Word	Meaning
1	Ancient Greek	κόσμος	order; lawful order, government; mode, fashion
2	Ancient Greek	θέσις	a setting, placement, arrangement; deposit;...
3	Ancient Greek	τίθημι	I put, place, set; I make, cause to be; I make
4	Proto-Indo-European	dʰeh₁-	to do, put, place

Words derived from “космона́вт”

Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Ancient Greek -τής →