ADJECTIVE (2)

1. of or relating to an orbit;
- Example: "orbital revolution"
- Example: "orbital velocity"

2. of or relating to the eye socket;
- Example: "orbital scale"
- Example: "orbital arch"

The Collaborative International Dictionary of English v.0.48:

Orbital \Or"bit*al\, a.
   Of or pertaining to an orbit. "Orbital revolution." --J. D.
   Forbes.
   [1913 Webster]

   Orbital index (Anat.), in the skull, the ratio of the
      vertical height to the transverse width of the orbit,
      which is taken as the standard, equal to 100.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "orbital":
   O-shaped, ambagious, backhanded, circuitous, circular, deviating,
   deviative, devious, digressive, discursive, excursive, helical,
   indirect, meandering, oblique, out-of-the-way, rotary, round,
   roundabout, spiral