Source : Webster's Revised Unabridged Dictionary (1913)

Suborbital \Sub*or"bit*al\, Suborbitar \Sub*or"bit*ar\, a.
   (Anat.)
   Situated under or below the orbit.

Source : WordNet®

suborbital
     adj 1: having or involving a trajectory of less than one orbit;
            "the first manned suborbital flight"
     2: situated on or below the floor of the eye socket; "a
        suborbital bone" [syn: {subocular}]