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[koz-muh-nawt, -not] /ˈkɒz məˌnɔt, -ˌnɒt/
a Russian or Soviet astronaut.
Origin of cosmonaut
1955-60; cosmo- + (aero)naut, representing Russian kosmonávt
Related forms
cosmonautic, adjective
cosmonautically, adverb
Can be confused
astronaut, cosmonaut. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for cosmonaut
  • But with the exception of a few astronaut and cosmonaut artists, no present-day artist has been in space.
  • Further, your comparison of cosmonaut to astronaut deaths is unfair.
  • Alex's boyhood idol, a cosmonaut who now occupies a reduced station in life, becomes part of the imposture.
British Dictionary definitions for cosmonaut


an astronaut, esp in the former Soviet Union
Word Origin
C20: from Russian kosmonavt, from cosmo- + Greek nautēs sailor; compare Argonaut
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for cosmonaut

1959, Englishing of Russian kosmonavt, ultimately from Greek kosmos (see cosmos) + nautes "sailor" (see naval).

Online Etymology Dictionary, © 2010 Douglas Harper
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cosmonaut in Culture

cosmonaut definition

A crew member of a space mission launched by the former Soviet Union.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Difficulty index for cosmonaut

Few English speakers likely know this word

Word Value for cosmonaut

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