cosmonaut

noun

cos·​mo·​naut ˈkäz-mə-ˌnȯt How to pronounce cosmonaut (audio)
-ˌnät
: an astronaut of the Soviet or Russian space program

Examples of cosmonaut in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
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, Orlando Sentinel, 15 Feb. 2025 Englert will play Anastasia, an untested female cosmonaut in the Soviet Space program. Denise Petski, Deadline, 13 Feb. 2025 The record holder for the longest continuous stay in space, a Russian cosmonaut and doctor named Valery Polyakov, spent a little more than fourteen months in low Earth orbit, which is relatively protected from space radiation and communication lags. Dhruv Khullar, The New Yorker, 10 Feb. 2025 Roscosmos cosmonaut Alexsandr Gorbunov will operate the arm during the spacewalk from inside the station. Eric Lagatta, USA TODAY, 19 Dec. 2024 See All Example Sentences for cosmonaut

Word History

Etymology

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

First Known Use

1955, in the meaning defined above

Time Traveler
The first known use of cosmonaut was in 1955

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Cite this Entry

“Cosmonaut.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cosmonaut. Accessed 3 Mar. 2025.

Kids Definition

cosmonaut

noun
cos·​mo·​naut ˈkäz-mə-ˌnȯt How to pronounce cosmonaut (audio)
-ˌnät
: a Soviet or Russian astronaut

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