Definition of isthmus in English:

isthmus

Syllabification: isth·mus
Pronunciation: /ˈisməs
 
/

noun (plural isthmuses)

  • 1A narrow strip of land with sea on either side, forming a link between two larger areas of land.
    More example sentences
    • Land routes are really old, especially through isthmuses.
    • The British arrived almost a century ago to build the railroad that slices across the isthmus, linking the Gulf of Mexico to the Pacific Ocean.
    • Only one study to date has used calibration points from the fossil record to estimate the divergence of sister species distributed on both sides of the isthmus.
  • 1.1 (plural isthmi /-mī/) Anatomy A narrow organ, passage, or piece of tissue connecting two larger parts.
    More example sentences
    • Thoracic aortic injuries most often occur at the aortic isthmus in the majority of the cases.
    • It has 2 lobes, called the right lobe and the left lobe, joined by a narrow isthmus.
    • The cervix forms the lower third, connected by a narrow isthmus to the main muscular body of the uterus.

Origin

mid 16th century: via Latin from Greek isthmos.

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