The Collaborative International Dictionary of English v.0.48:
Suborbital \Sub*or"bit*al\, Suborbitar \Sub*or"bit*ar\, a. (Anat.) Situated under or below the orbit. [1913 Webster]WordNet (r) 3.0 (2006):
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: suborbital, subocular]