[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
Blast off with an astronaut on his journey into space.
If the timing is right, day-trippers may also get the chance to meet an
  astronaut and even view a liftoff.
The astronaut said he used a push-and-glide motion similar to cross-country
  skiing when he was on the moon.
Not everyone gets to be an astronaut when they grow up.
Images for astronaut
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