[koz-muh-nawt, -not]
a Russian or Soviet astronaut.

1955–60; cosmo- + (aero)naut, representing Russian kosmonávt

cosmonautic, adjective
cosmonautically, adverb

astronaut, cosmonaut. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cosmonaut (ˈkɒzməˌnɔːt)
an astronaut, esp in the former Soviet Union
[C20: from Russian kosmonavt, from cosmo- + Greek nautēs sailor; compare Argonaut]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1959, Anglicization of Rus. kosmonavt, ult. from Gk. kosmos (see cosmos) + nautes "sailor" (see naval).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

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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Example sentences
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.
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