isth·​mus | \ ˈi-sməs How to pronounce isthmus (audio) \

Definition of isthmus

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

William Easton surrounded a green isthmus representing Seattle with ribbons of blue: Puget Sound and Lake Washington. Christine Clarridge, The Seattle Times, "Last month, we asked readers what Seattle’s city flag should look like. Here’s what you came up with.," 7 July 2019 From June 10th Mexico will also deploy 6,000 troops of its newly created national guard to two states—Chiapas, bordering Guatemala, and Oaxaca, which has a narrow isthmus—to stop migrants and people-smugglers. The Economist, "Mexico rejoices after averting Donald Trump’s tariffs threat," 9 June 2019 Advertising The road would split an isthmus as narrow as 3 miles (4.8 kilometers) on the southern border of Izembek Lagoon. Dan Joling, The Seattle Times, "Judge rejects Trump plan for road in Alaska wildlife refuge," 29 Mar. 2019 The United States wants to see more migration patrols along the 200km-wide southern Mexican isthmus. The Economist, "Mexico has little choice but to placate Donald Trump," 6 June 2019 The work is like discovering a mysterious isthmus connecting two landmasses that had previously been thought to be oceans apart. Quanta Magazine, "A New Map Traces the Limits of Computation," 29 Sep. 2015 The isthmus separates King Cove, a fishing community of about 900 people sandwiched between ocean and mountains, and an all-weather airport at Cold Bay. Dan Joling, The Seattle Times, "Judge rejects Trump plan for road in Alaska wildlife refuge," 29 Mar. 2019 Another surprise was the discovery of flowering vegetation that had taken root on the volcanic cone and in the mud of the isthmus connecting HTHH to its neighbor. Jill Kiedaisch, Popular Mechanics, "A Young Island in the South Pacific Oozes Mysteries and Mud," 5 Feb. 2019 For most, a visit to the isthmus country begins with a quick stop in the capital city before jetting off to nature. Julia Eskins, Vogue, "Why Panama is the Place to Go in 2019," 1 Jan. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'isthmus.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of isthmus

1555, in the meaning defined at sense 1

History and Etymology for isthmus

Latin, from Greek isthmos

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Last Updated

15 Aug 2019

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The first known use of isthmus was in 1555

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More Definitions for isthmus



English Language Learners Definition of isthmus

: a narrow area of land that connects two larger land areas


isth·​mus | \ ˈi-sməs How to pronounce isthmus (audio) \

Kids Definition of isthmus

: a narrow strip of land separating two bodies of water and connecting two larger areas of land


isth·​mus | \ ˈis-məs How to pronounce isthmus (audio) \

Medical Definition of isthmus

: 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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More from Merriam-Webster on isthmus

Rhyming Dictionary: Words that rhyme with isthmus

Thesaurus: All synonyms and antonyms for isthmus

Spanish Central: Translation of isthmus

Nglish: Translation of isthmus for Spanish Speakers Encyclopedia article about isthmus

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of or relating to the heavens

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