Where does “cosmonautic” come from?

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

cosmonautic (English): Of or related to cosmonauts or cosmonautics

Definitions

Of or related to cosmonauts or cosmonautics

Ancestry of “cosmonautic”, step by step

cosmonautic traces back through 3 separate lines of ancestry.

via English cosmonaut

Step	Language	Word	Meaning
1	English	cosmonaut	An astronaut, especially a Russian or Soviet one
2	Russian	космона́вт	cosmonaut (the Russian or Soviet equivalent of an astronaut)
3	Ancient Greek	ναύτης	sailor, seaman; companion at sea
4	Ancient Greek	-τής	Appended to verbs to form agent nouns
5	Ancient Greek	πεῖρα	trial, experiment, attempt
6	Proto-Indo-European	per-	before, in front; first; to go through
7	Proto-Indo-European	pr̥tós	passed , crossed

via English ic

Step	Language	Word	Meaning
1	English	ic	related or pertaining to; having the character of

via French cosmonautique

Step	Language	Word	Meaning
1	French	cosmonautique	—

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