astronaut (n.) Look up astronaut at Dictionary.com
"space-traveler," 1929 in scientific speculation, popularized from 1961 by U.S. space program, from astro- "star" + nautes "sailor," from PIE root *nāu- (2) "boat" (see naval). French astronautique (adj.) had been coined 1927 by "J.H. Rosny," pen name of Belgian-born science fiction writer Joseph Henri Honoré Boex (1856-1940) on model of aéronautique, and Astronaut was used in 1880 as the name of a fictional spaceship by English writer Percy Greg (1836-1889) in "Across the Zodiac."