orbiter

Concise Oxford English Dictionary © 2008 Oxford University Press:
orbit/ˈɔːbɪt/

▶noun

• 1 the regularly repeated elliptical course of a celestial object or spacecraft about a star or planet.

  ■ the path of an electron round an atomic nucleus.

• 2 a field of activity or influence: they brought many friends within the orbit of our lives.

• 3 Anatomy the eye socket.

▶verb (orbits, orbiting, orbited) move in orbit round (a star or planet).

■ put (a satellite) into orbit.

– phrases
into orbit informal into a state of heightened activity, anger, or excitement.

– derivatives
orbiter noun.

– origin C16: from L. orbita ‘course, track’, fem. of orbitus ‘circular’.