From Longman Dictionary of Contemporary Englishspacemanspace‧man /ˈspeɪsmæn/ noun (plural spacemen /-men/) [countable] 1 informalTTSBO a man who travels into space SYN astronaut2 RFsomeone in stories who visits the Earth from another world → alien
Examples from the Corpus
spaceman• What do you do if you see a spaceman?• For instance, mankind could be replaced by humanity, craftsman by artisan, forefathers by ancestors, spaceman by astronaut and so on.• I think all you would-be spacemen are just little boys at heart, wanting to play an elaborate game.• But Von Daniken, like others of his creed, believes that evidence of spacemen already exists on Earth. 