cosmonaut

noun

cos·​mo·​naut ˈkäz-mə-ˌnȯt 

-ˌnät

: an astronaut of the Soviet or Russian space program

Examples of cosmonaut in a Sentence

Recent Examples on the Web

Luke Delaney, Canadian Space Agency astronaut Joshua Kutryk and Roscosmos cosmonaut Sergey Teteryatnikov. —Richard Tribou, The Orlando Sentinel, 17 June 2026

Russian cosmonauts must pressurize the tunnel to access the Progress spacecraft that dock there and unload and stow cargo on the vehicles. —Eric Berger, ArsTechnica, 15 June 2026

Meir wasn't just in the Dragon capsule for fun, her and the rest of the Crew-12 astronauts were told to shelter in the capsule as the cosmonauts, Sergey Kud-Sverchkov and Sergei Mikaev, attempted to fix an ongoing leak on the station. —Chelsea Gohd, Space.com, 9 June 2026

One, of course, is the branch with all the cosmonauts. —Ben Travers, IndieWire, 29 May 2026

Word History

Etymology

Russian kosmonavt, from Greek kosmos + Russian -navt (as in aeronavt aeronaut)

First Known Use

1955, in the meaning defined above

Rhymes for cosmonaut

• aeronaut
• aforethought
• afterthought
• apricot
• argonaut
• astronaut
• camelot
• coffeepot
• concordat
• entrepot
• flowerpot
• huguenot

Kids Definition

cosmonaut

noun

cos·​mo·​naut ˈkäz-mə-ˌnȯt 

-ˌnät

: a Soviet or Russian astronaut