Here are some examples of words derived from "terr":
* Terrestrial: Relating to the Earth or its inhabitants.
* Terrain: The physical features of an area of land.
* Territory: A region of land under the control of a particular state or ruler.
* Terracotta: A type of earthenware clay.
* Terrace: A raised platform of earth.
* Inter: To bury. (From the Latin "interrare" meaning "to bury in the earth")
As you can see, the meaning of "terr" is reflected in the words it forms, often relating to the Earth, its surface, or the processes associated with it.