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
Recent Examples of isthmus from the Web
On Dec. 20, 1989, Operation Just Cause was launched, with more than 26,000 U.S. troops deployed to the tiny isthmus nation.
It’s connected to Ukraine by a narrow isthmus to the north but is separated from Russia by a stretch of water called the Kerch Strait.
Similar problems have been reported all along the Tehuantepec isthmus, one of the western hemisphere’s windiest places.
The tiny rock measuring 2.25 square miles, with a population of 30,000, is a British overseas territory located on the Iberian Peninsula, connected to the European mainland by an isthmus near the Spanish city of Cádiz.
Around three million years ago, the isthmus of Panama formed a solid connection between North and South America.
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.
Origin and Etymology of isthmus
Latin, from Greek isthmos
First Known Use: 1555See Words from the same year
ISTHMUS Defined for English Language Learners
Definition of isthmus for English Language Learners
: a narrow area of land that connects two larger land areas
ISTHMUS Defined for Kids
Definition of isthmus for Students
: a narrow strip of land separating two bodies of water and connecting two larger areas of land
Medical Definition of isthmus
: a contracted anatomical part or passage connecting two larger structures or cavities: asa: an embryonic constriction separating the midbrain from the hindbrainb: the lower portion of the uterine corpus
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