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Definition of astronaut

astronaut

/ˈæs.trə.nɔːt/
as · tro · naut
Adverb:astronautically
•
Plural:astronauts
•
Adjective:astronautic
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astronaut Lexical Profile

astronaut Game Scores & Validity

• noun

1

A person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft, or any traveler into outer space.

Example

"The veteran astronaut spent six months aboard the International Space Station conducting microgravity experiments."

Synonyms
View all synonyms for astronaut

• Nearby Words

astrologically
astrologist
astrology
astronaut
astronautical
astronomer
astronomic

Word Origin & Etymology

Coined in the late 19th century for a fictional spacecraft and adopted for human spaceflight in the late 1920s, combining Ancient Greek 'astron' (star) and 'nautes' (sailor), modeled on 'aeronaut'.

Cite this Entry

Wordmom. (2026). Definition of Astronaut. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/astronaut
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