cos ‧ mo ‧ naut /ˈkɒzmənɔːt $ ˈkɑːzmənɒːt/ BrE AmE noun [countable]
[ Date: 1900-2000 ; Language: Russian ; Origin: kosmonavt , from Greek kosmos ( ⇨ ↑ cosmos ) + Russian -navt (as in aeronavt 'flyer' ; , ↑ aeronautics ) ]
an ↑ astronaut from the former Soviet Union