astronaut

noun

as·​tro·​naut ˈa-strə-ˌnȯt 

-ˌnät

plural astronauts

: a person whose profession is to travel beyond the earth's atmosphere

NASA on Wednesday introduced the group of astronauts it has chosen for upcoming missions to the moon. The program, called Artemis, aims to send people back to the moon for the first time since the end of NASA's Apollo program in 1972.

—Kenneth Chang

broadly : any person who travels beyond the earth's atmosphere

William Shatner, the 90-year-old actor of "Star Trek" fame, endured a 10-minute, rocket-powered ride to the edge of space … . In that moment, at least one thing became certain: Yes, a nonagenarian can be an astronaut.

—Jackie Wattles

Word Icons

Examples of astronaut in a Sentence

Recent Examples on the Web

Some children dream of being astronauts or doctors. —Connie Etemadi, USA Today, 29 Aug. 2025

Meanwhile, Musk recently told followers of his Mars ventures on X that the first Starship flight to the ruddy-colored planet carrying astronauts will likely launch five and one-half years from now. —Kevin Holden Platt, Forbes.com, 28 Aug. 2025

Charlie Camarda, a former NASA astronaut, engineer, and materials scientist, worked on alternatives to the shuttle's heat shield beginning in the 1970s. —Ashley Belanger, ArsTechnica, 26 Aug. 2025

The combination of the Starship, which could someday carry astronauts and cargo to the moon and Mars, and the Super Heavy booster, the rocket that propels the Starship in space, is more than 400 feet tall, made of stainless steel, and is being designed by SpaceX to be fully reusable. —Matthew Glasser, ABC News, 26 Aug. 2025

Word History

Etymology

astro- + -naut (in aeronaut)

Note: See note at astronautics.

First Known Use

1928, in the meaning defined above

Rhymes for astronaut

• aeronaut
• aforethought
• afterthought
• apricot
• argonaut
• camelot
• coffeepot
• concordat
• cosmonaut
• entrepot
• flowerpot
• huguenot

Kids Definition

astronaut

noun

as·​tro·​naut ˈas-trə-ˌnȯt 

-nät

: a traveler in a spacecraft

astronautic

ˌas-trə-ˈnȯt-ik

adjective

or astronautical

-i-kəl,

-nät-

Etymology

from astro- "star, heavens" (derived from Greek astron "star") and -naut (derived from Greek nautēs "sailor," from naus "ship") — related to nausea, nautical see Word History at nausea