suborbital adjective 2noun 2forms 1 adjective2 •Not reaching orbit; having a trajectory that does not reach orbital velocity and so must return to ground eventually.The first rocket test was suborbital; it didn't even get off the ground but rather exploded on the launchpad. •Below the orbit of the eye. noun2 •A suborbital bone. •A portion of an orbital. formssuborbitals
