Astronaut Definition

ăstrə-nôt
astronauts
noun
astronauts
A person trained to pilot, navigate, or otherwise participate as a crew member of a spacecraft.
American Heritage
A person trained to make rocket flights in outer space.
Webster's New World

A member of the crew of a spaceship or other spacecraft that travels beyond Earth's atmosphere, or someone trained to serve that purpose.

Wiktionary
Synonyms:

Other Word Forms of Astronaut

Noun

Singular:
astronaut
Plural:
astronauts

Origin of Astronaut

  • astro– Greek nautēs sailor (from naus ship nāu- in Indo-European roots)

    From American Heritage Dictionary of the English Language, 5th Edition

  • Coined from Ancient Greek ἄστρον (ástron, “star”) and ναύτης (naútēs, “sailor”).

    From Wiktionary

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