Isthmus definitions

ĭs'məs
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.

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A narrow strip of land having water at each side and connecting two larger bodies of land.
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A narrow strip of tissue connecting two larger parts of an organ.

The isthmus of the thyroid.

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A narrow strip of land, bordered on both sides by water, and connecting two larger landmasses.
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A narrow strip of land connecting two larger masses of land.
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A narrow strip of tissue joining two larger organs or parts of an organ.
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A narrow passage connecting two larger cavities.
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A narrow passage between two larger cavities.

The isthmus of the fallopian tubes.

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A narrow strip of land connecting two larger masses of land.
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A narrow strip of tissue joining two larger organs or parts of an organ.
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A narrow passage connecting two larger cavities.
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A narrow strip of land connecting two larger masses of land.
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(anatomy) Any such narrow part connecting two larger structures.
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Origin of isthmus

Via Latin isthmus, from Ancient Greek ἰσθμός (isthmos, “neck”). Cognate to Old Norse eið (“isthmus”).