1) Connecting two land masses 2) Dry land 3) Earth 4) Ground 5) Land 6) Native of Panama 7) Person from Panama 8) Solid ground 9) Terra firma 
Isthmian is the adjective pertaining to an isthmus It may also refer to: ...
living on or situated on an isthmus
• (a.) Of or pertaining to an isthmus, especially to the Isthmus of Corinth, in Greece.
Isth'mi·an adjective [ Latin Isthmius , Greek .... See Isthmus .] Of or pertaining to an isthmus, especially to the Isthmus of Corinth, in Greece. Isthmian games (Gr. Antiq.) , 
[adj] - of or relating to or forming an isthmus
isthmian, isthmic 1. Relating to, or forming an isthmus. 2. Referring to an isthmus.
adjective of or relating to or forming an isthmus
of or pertaining to an isthmus. · (cap.) of or pertaining to the Isthmus of Corinth or the Isthmus of Panama.