Definition of astronaut noun from the Oxford Advanced Learner's Dictionary

 

astronaut

 noun
noun
BrE BrE//ˈæstrənɔːt//
 
; NAmE NAmE//ˈæstrənɔːt//
 
Space travel
 
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a person whose job involves travelling and working in a spacecraft sending astronauts into space Wordfinderastronaut, countdown, dock, launch, mission, orbit, rocket, satellite, space, weightless See related entries: Space travel Word Origin 1920s: from astro-, on the pattern of aeronaut and aquanaut.
See the Oxford Advanced American Dictionary entry: astronaut