Толковый словарь английского языка - isthmian

I. noun Date: 1601 a native or inhabitant of an isthmus, a native or inhabitant of the Isthmus of Panama, II. adjective Date: 1603 of, relating to, or situated in or near an isthmus: as, of or relating to the Isthmus of Corinth in Greece or the games held there in ancient times, of or relating to the Isthmus of Panama connecting the North American and South American continents