Supraorbital literally means "above the orbit" (from the Latin Supra = above, and orbit). The antonyms would come being Infraorbital or Suborbital.No can get an example because I don't know what is the contextoen that you found or read this word; probably to read this explanation clears you panorama.
It is an adjective that does not support RAE. It would derive from the latin orbit orbitae: footprint that leaves a wagon wheel and this, in turn, from orbis orbis: wheel, circle with the prefix supra - that means " " above, " up " It would be what is above or outside of the orbit that is the path that describes a physical body in its motion around another more mass under the gravitational force. The SAR supports intraorbital to it would be the antonym.