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

Russian cosmonaut Aleksandr Samokutyaev, who served twice as a crew member aboard the International Space Station (ISS), including during the final US space shuttle mission in 2011, has died at the age of 56. — Robert Pearlman, ArsTechnica, 18 June 2026

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

But it was not immediately known when cosmonauts Sergey Kud-Sverchkov and Sergey Mikaev would attempt the additional repair. — William Harwood, CBS News, 5 June 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