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of, on, or relating to the earth:increased ultraviolet radiation may disrupt terrestrial ecosystems denoting television broadcasting using equipment situated on the ground rather than by satellite:terrestrial and cable technology of or on dry land:a submarine eruption will be much more explosive than its terrestrial counterpart (of an animal) living on or in the ground; not aquatic, arboreal, or aerial. (of a plant) growing on land or in the soil; not aquatic or epiphytic. Astronomy (of a planet) similar in size or composition to the earth, especially being one of the four inner planets of our solar system. archaic of or relating to the earth as opposed to heaven.
an inhabitant of the earth.
Remember that terrestrial
is spelled with a double r
in the middle.