noun. One that orbits, especially a spacecraft that orbits a celestial body.

noun. an object which orbits another, especially a spacecraft that orbits a planet etc. without landing on it

noun. man-made equipment that orbits around the earth or the moon

"I stated that the development and production cost of Shuttle C would approach that of Ares V since the orbiter is an expendable vehicle."

Space Shuttle  

equipment  

Sputnik  astronomy satellite  ballistic capsule  communications satellite  meteorological satellite  

flyby  lander  rover  spacecraft