- The definition of an isthmus is a narrow strip of land that connects two larger bodies of land and is surrounded by water on two sides.
An example of an isthmus is a land bridge.
Islands connected by an isthmus.
nounpl. isthmuses or isthmi
- a narrow strip of land having water at each side and connecting two larger bodies of land
- a narrow strip of tissue connecting two larger parts of an organ: the isthmus of the thyroid
- a narrow passage between two larger cavities: the isthmus of the fallopian tubes
Origin of isthmusClassical Latin ; from Classical Greek isthmos, a neck, narrow passage, isthmus
nounpl. isth·mus·es or isth·mi
- A narrow strip of land connecting two larger masses of land.
- Anatomy a. A narrow strip of tissue joining two larger organs or parts of an organ.b. A narrow passage connecting two larger cavities.
Origin of isthmusLatin, from Greek isthmos.
(plural isthmuses or isthmi)
Via Latin isthmus, from Ancient Greek ἰσθμός (isthmos, “neck”). Cognate to Old Norse eið (“isthmus”).