: relating to the earth or its people <Does anything like terrestrial life exist on other planets?>
: living or growing on land <terrestrial birds>
Word Root of TERRESTRIAL
The Latin word terra, meaning “earth,”“land,” or “ground,” gives us the root terr. Words from the Latin terra have something to do with the earth or land. A territory is an area of land ruled by a particular government. A terrace is a piece of land with a flat top. Anything terrestrial lives on land and not in water.