"of or pertaining to the planet Earth," 1881, in science fiction writing, from Latin terra (see terrain). Also used as a noun meaning "inhabitant of the Earth" (1953). An earlier form, terrene was used in Middle English in sense of "belonging to this world, earthly, secular, temporal" (c.1300), later, "of the Earth as a planet" (1630s).
Examples from the Web for terran
A nuisance on Balera, which is the equivalent of a Terran swamp.Join Our Gang?
Sterling E. Lanier
The kifs, the Venusian equivalent of the Terran ant, stole his food.Happy Ending
"There are a lot of things no Terran ever will understand," Sawtelle replied instantly.
Terran time and calendar were adapted as a matter of course.
If the Ardans could stop them, no Terran need ever know anything about them.