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

Its four crew members are NASA astronauts Commander Matthew Dominick, Pilot Michael Barratt, Mission Specialist Jeanette Epps and Roscosmos cosmonaut Mission Specialist Alexander Grebenkin. —Richard Tribou, The Orlando Sentinel, 4 Aug. 2025

Platonov was selected as a cosmonaut in 2018 after studying engineering and aircraft operations and serving in the Russian Air Force. —Brett Tingley, Space.com, 25 July 2025

Wilmore and Williams would return alongside SpaceX Crew 9 members Nick Hague and Roscosmos cosmonaut Aleksandr Gorbunov, who are also at the ISS. —Andy Humbles, The Tennessean, 2 July 2025

Three American astronauts and two Russian (then Soviet) cosmonauts met up for just under two days of joint operations, setting the stage for future cooperation in space. —Robert Z. Pearlman, Space.com, 17 July 2025

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