a narrow strip of land, bordered on both sides by water, connecting two larger bodies of land.
Anatomy, Zoology. a connecting, usually narrow, part, organ, or passage, especially when joining structures or cavities larger than itself.
Ichthyology. the narrow fleshy area between the sides of the lower jaw of a fish.
- isthmoid, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use isthmus in a sentence
At the turn of the century, the United States embarked on the project of building a canal across the isthmus of Panama, hoping to carve a faster transcontinental shipping route and to cement the United States’ strategic dominance in the region.
For example, on Saunders Island on the Falkland Islands, I was in an area called the Neck, a little isthmus.A king penguin and a wedding anniversary inspired a couple to see all 18 species | Andrea Sachs | March 11, 2021 | Washington Post
Eleventh place is quite the crowning achievement for the little isthmus—especially considering the low quality offerings.House of the Witch: The Renegade Craft Brewers of Panama | Jeff Campagna | November 30, 2014 | THE DAILY BEAST
Is it really possible that we were once so wrapped around that isthmus?
In the Shafrazi island, Warhol and Basquiat are up on this little isthmus together, a little spit of land.
The only thing it rhymes with is isthmus, and that but loosely.
Lionel Wafer in his travels upon the isthmus of Darien in 1699 saw the plant growing and cultivated by the natives.Tobacco; Its History, Varieties, Culture, Manufacture and Commerce | E. R. Billings.
Continet hic isthmus leucas admod quingentas circuitu suo, emque occupant Soriqui populi.
In this isthmus is port royal, where we are now sojourning, lying on the parallel of 44 40'.
This isthmus has a circuit of fully five hundred leagues and is occupied by the Soriquois tribe.
The town of the same name lies in the midst of a small plain, which forms the half of an isthmus.A Woman's Journey Round the World | Ida Pfeiffer
British Dictionary definitions for isthmus
a narrow strip of land connecting two relatively large land areas
a narrow band of tissue connecting two larger parts of a structure
a narrow passage connecting two cavities
- isthmoid, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for isthmus
A narrow strip of land connecting two larger masses of land.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Cultural definitions for isthmus
A narrow strip of land that connects two larger bodies of land and has water on both sides.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.