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Of or pertaining to an orbit. "Orbital revolution." J. D. Forbes. 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.

Same as Antorbital.

The antorbital bone.

Below the orbit; as, the infraorbital foramen; the infraorbital nerve.

Between the orbits; as, the interorbital septum.

Situated behind the orbit; as, the postorbital scales of some fishes and reptiles. -- n.

a. (Anat.) Situated in front or the orbit.

Situated under or below the orbit.

Situated above the orbit of the eye. Supraorbital point (Anat.), the middle point of the supraorbital line, which is a line drawn across the narrowest part of the forehead, separating the face from the cranium; the ophryon.

Having the orbital index relatively large; having the orbits narrow transversely; -- opposed to microseme.

Having a medium orbital index; having orbits neither broad nor narrow; between megaseme and microseme.

Having the orbital index relatively small; having the orbits broad transversely; -- opposed to Ant: megaseme.

The supraorbital point.

Orbital. [R.] Dunglison.

Orbital. [R.]

Same as Postorbital.

Of or pertaining to the eyebrows; supraorbital.