[as-truh-nawt, -not]
a person engaged in or trained for spaceflight.

1925–30; astro- + (aero)naut, probably via French astronaute; see astronautical

astronaut, cosmonaut. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
astronaut (ˈæstrəˌnɔːt)
See also cosmonaut a person trained for travelling in space
[C20: from astro- + -naut from Greek nautēs sailor, on the model of aeronaut]

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

coined 1929 (but popularized 1961) from astro- + nautes "sailor" (see naval). Fr. astronautique (adj.) had been coined 1927 by "J.H. Rosny," pen name of Belgian-born science fiction writer Joseph Henri Honoré Boex (18561940).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

astronaut definition

A crew member of a space mission launched by the United States. (See Apollo program and Mercury program.)

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
Its primary goal was to test parachutes and other equipment for pilots and
Astronauts must bring what they need, including oxygen, because they cannot
  rely on their environment to provide it.
Smashed bits of space equipment orbit along with items dropped by astronauts,
  including tools and the odd glove.
Three astronauts were on board, with their mission expected to last about three
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