1
: a narrow strip of land connecting two larger land areas
2
: a narrow anatomical part or passage connecting two larger structures or cavities
Examples of isthmus in a Sentence
Recent Examples on the Web
The latest screwworm detections in Oaxaca and Veracruz are just beyond the isthmus.
—
Sarah Zhang, The Atlantic, 27 May 2025
Steamships laden with mail sailed from the East Coast to Panama, where the mail was taken off the ships, transported in canoes or on pack animals, and handed to another steamship waiting on the Pacific side of the isthmus.
—Hailey Branson-Potts, Los Angeles Times, 23 May 2025
It is only connected to Faial by an isthmus, a narrow strip of land with a dune system.
—Emese MacZko, Forbes.com, 8 May 2025
Portages across the isthmus of Panama could shorten that, if there was a boat waiting on the Pacific side—all this was more than half a century before the Panama Canal existed.
—Matthew Wills, JSTOR Daily, 23 Apr. 2025
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Sarah Zhang, The Atlantic, 27 May 2025
Steamships laden with mail sailed from the East Coast to Panama, where the mail was taken off the ships, transported in canoes or on pack animals, and handed to another steamship waiting on the Pacific side of the isthmus.
—Hailey Branson-Potts, Los Angeles Times, 23 May 2025
It is only connected to Faial by an isthmus, a narrow strip of land with a dune system.
—Emese MacZko, Forbes.com, 8 May 2025
Portages across the isthmus of Panama could shorten that, if there was a boat waiting on the Pacific side—all this was more than half a century before the Panama Canal existed.
—Matthew Wills, JSTOR Daily, 23 Apr. 2025
See All Example Sentences for isthmus
Cite this Entry
“Isthmus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isthmus. Accessed 4 Jun. 2025.
Copy CitationKids Definition
isthmus
noun
isth·mus
ˈis-məs 
: a narrow strip of land connecting two larger land areas
Medical Definition
isthmus
noun
isth·mus
ˈis-məs
: a contracted anatomical part or passage connecting two larger structures or cavities: as
a
: an embryonic constriction separating the midbrain from the hindbrain
b
: the lower portion of the uterine corpus
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