The Collaborative International Dictionary of English v.0.48:
spaceman \space"man`\, n. 1. an astronaut. [PJC] 2. an intelligent creature from outer space; an extraterrestrial; -- a fictional or hypothetical being, never actually observed. [PJC]WordNet (r) 3.0 (2006):
spaceman n 1: a person trained to travel in a spacecraft; "the Russians called their astronauts cosmonauts" [syn: astronaut, spaceman, cosmonaut]