terrestris

Etymology
Perhaps from, from , the first of which would also be the base of. The suffix would otherwise be seen in and maybe in, ,. Reanalysis as terr-estris, as if derived from, would have yielded a new suffix which is found in e.g.  and. From a synchronic perspective of Classical Latin, terrestris indeed contained the -estris-suffix.

Adjective

 * 1) Of or pertaining to the earth or land; terrestrial, earthly.