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

Tito went through cosmonaut training for eight months at Russia’s Star City, including grueling 8G centrifuge tests, without not knowing if he would be permitted on the flight. —Michael Goldstein, Forbes.com, 24 May 2026

Thirty years ago, for example, Pepsi paid about $5 million to have a cosmonaut film a large Pepsi can replica outside the Mir space station. —Eric Berger, ArsTechnica, 20 May 2026

Once hatches are opened, the spacecraft will be unloaded by Crew 12 commander Jessica Meir and her three crewmates, pilot Jack Hathaway, European Space Agency astronaut Sophie Adenot and cosmonaut Andrey Fedyaev. —William Harwood, CBS News, 15 May 2026

Irina’s head is spinning, but there’s no convincing former cosmonaut Lenya Polivanov not to do this. —Sophie Brookover, Vulture, 15 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