Dictionary

Terrestrian en · ADJ

Of or relating to Earth or its inhabitants; of terrestrial origin.
- In the meantime the Terrestrian and Venerian governments were already preparing vigorously for further inroads. 1930 Fall, John Wood Campbell, “Black Star Passes”, in Amazing Stories Quarterly, volume 3, number 4, page 500:

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more Terrestrian	Degree=Cmp		lexicographic
most Terrestrian	Degree=Sup		lexicographic

An inhabitant of Earth; a human.
- How would it look for the First Administrator to go limping around the galaxies explaining that he was behind schedule because his ship got wrecked on Sol III and the Terrestrians were incapable of matching his drives? 1950 November, Raymond Fisher Jones, “Tools of the Trade”, in Astounding Science Fiction, volume 46, number 3, page 55:
- This rocket squad was composed almost solely of Terrestrians, for they were used to the greater gravity of Earth, and could stand greater acceleration than could Venerians. 1930 Fall, John Wood Campbell, “Black Star Passes”, in Amazing Stories Quarterly, volume 3, number 4, page 516:

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Terrestrians	Number=Plur		lexicographic