Not straying far from its Latin root terra, meaning "earth," terrestrial means "of the earth." If it's terrestrial, you'll find it on earth. If it's extraterrestrial, you'll find it emerging from a UFO.

The adjective terrestrial can also be used to describe something that lives on land (as opposed to living in water, for example). "On their trip to the rain forest, the scientists were charged with cataloging terrestrial animals. Another group was going to be in charge of cataloging the aquatic animals." The adjective can also be used to describe something that is mundane in character. The teenager cried, "My life is boring and full of terrestrial events like going to band practice and to class!"

Definitions of terrestrial
  1. adjective
    of or relating to or characteristic of the planet Earth or its inhabitants
    “this terrestrial ball”
    synonyms: planetary
  2. adjective
    concerned with the world or worldly matters
    “he developed an immense terrestrial practicality”
    synonyms: mundane
    secular, temporal, worldly
    characteristic of or devoted to the temporal world as opposed to the spiritual world
  3. adjective
    of this earth
    “the nearest to an angelic being that treads this terrestrial ball”
    synonyms: sublunar, sublunary
    of or belonging to or characteristic of this earth as distinguished from heaven
  4. adjective
    of or relating to or inhabiting the land as opposed to the sea or air
    synonyms: tellurian, telluric, terrene
  5. adjective
    operating or living or growing on land
    on the edge of the land
    traveling or passing over land
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    operating or living or growing in water
    operating or living on land and in water
    native to or inhabiting the sea
    semiaquatic, subaquatic
    partially aquatic; living or growing partly on land and partly in water
    subaquatic, subaqueous, submerged, submersed, underwater
    growing or remaining under water
    amphibiotic, semiaquatic
    having an aquatic early or larval form and a terrestrial adult form
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