• synonyms


[koz-muh-nawt, -not]
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  1. a Russian or Soviet astronaut.
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Origin of cosmonaut

1955–60; cosmo- + (aero)naut, representing Russian kosmonávt
Related formscos·mo·nau·tic, adjectivecos·mo·nau·ti·cal·ly, adverb
Can be confusedastronaut cosmonaut
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for cosmonaut


  1. an astronaut, esp in the former Soviet Union
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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

Word Origin and History for cosmonaut


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

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Online Etymology Dictionary, © 2010 Douglas Harper

cosmonaut in Culture


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

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.