- isthmus - a relatively narrow strip of land (with water on both sides) connecting two larger land areas
--1 is a kind of land, dry land, earth, ground, solid ground, terra firma
--1 has particulars:Central America; Isthmus of Corinth; Isthmus of Kra; Isthmus of Panama; Isthmus of Suez; Isthmus of Tehuantepec; Karelian Isthmus - isthmus - a narrow band of tissue connecting two larger parts of an anatomical structure
--2 is a kind of tissue
- isthmus - a narrow band of tissue connecting two larger parts of an anatomical structure