/is"mee euhn/ , adj.
1. of or pertaining to an isthmus.
2. ( cap. ) of or pertaining to the Isthmus of Corinth or the Isthmus of Panama.
n.
3. a native or inhabitant of an isthmus.
[ 1595-1605; isthmi ( us ) ( ísthmios of a neck of land, equiv. to isthm ( ós ) neck + -ios adj. suffix) + -AN ]