- 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)