trans-Martian en · ADJ
Etymology
From trans- + Martian.
Meanings
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(not-comparable) Lying beyond the orbit of the planet Mars.
Then, less than a year before the discovery of Neptune, a fifth trans-Martian object and the twelfth planet, Astraea, had been found.
2009 [2007], David A. Weintraub, Is Pluto a Planet?: A Historical Journey through the Solar System, Princeton, NJ: Princeton University Press, →ISBN, page 115: