isthmus

/ˈɪsθməs//ˈɪsməs//ˈɪstməs/
noun
1 A narrow strip of land with sea on either side, forming a link between two larger areas of land.
2 Anatomy
A narrow organ, passage, or piece of tissue connecting two larger parts.

Origin
Mid 16th century: via Latin from Greek isthmos.

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The isthmus of Panama, once penetrated by the famous canal, became one of the busiest shipping lanes ine world.

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In an idle moment, I wonder if one might consider the Panama canal a pain in the “neck” since an isthmus is sort of like a neck of land…?

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