Definition of moonman in US English:
moonman
noun
1Cant. A Gypsy. Now historical.
2An imagined inhabitant of the moon.
3A person involved in astronautics; (later) specifically an astronaut.
Origin
Early 17th century; earliest use found in Thomas Dekker (c1572–1632), playwright and pamphleteer. From moon + man.
Pronunciation
moonman
/ˈmuːnman/