Definition of: terrestrial

(tə·res′trē·əl) adjective
1. Belonging to the earth: opposed to celestial or cosmic.
2. Pertaining to land or earth: terrestrial magnetism.
3. Biol. Living on or growing in the earth or land: opposed to aquatic, aerial, etc.
4. Belonging to or consisting of land, as distinct from water, trees, etc.
5. Worldly; mundane.
—noun An inhabitant of the earth. [<L terrestris <L terra land]
—ter·res′tri·al·ly adverb
—ter·res′tri·al·ness noun