isthmus

[is-muhs]
noun, plural isthmuses, isthmi [is-mahy] .
1.
a narrow strip of land, bordered on both sides by water, connecting two larger bodies of land.
2.
Anatomy, Zoology. a connecting, usually narrow, part, organ, or passage, especially when joining structures or cavities larger than itself.
3.
Ichthyology. the narrow fleshy area between the sides of the lower jaw of a fish.

Origin:
1545–55; < Latin < Greek isthmós neck (of land)

isthmoid, adjective
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World English Dictionary
isthmus (ˈɪsməs)
 
n , pl -muses, -mi
1.  a narrow strip of land connecting two relatively large land areas
2.  anatomy
 a.  a narrow band of tissue connecting two larger parts of a structure
 b.  a narrow passage connecting two cavities
 
[C16: from Latin, from Greek isthmos]
 
'isthmoid
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

isthmus
1555, from Gk. isthmos "narrow neck of land," especially that of Corinth, of unknown origin, perhaps from eimi "to go" + suffix -thmo (cf. ithma "a step, movement").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

isthmus isth·mus (ĭs'məs)
n. pl. isth·mus·es or isth·mi (-mī')
A constriction or narrow passage connecting two larger parts of an organ or other anatomical structure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
isthmus   (ĭs'məs)  Pronunciation Key 
Plural isthmuses or isthmi (ĭs'mī')
A narrow strip of land connecting two larger masses of land.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
isthmus [(is-muhs)]

A narrow strip of land that connects two larger bodies of land and has water on both sides.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

isthmus

narrow strip of land connecting two large land areas otherwise separated by the sea. Unquestionably the two most famous are the Isthmus of Panama, connecting North and South America, and the Isthmus of Suez, connecting Africa and Asia. Historically the Isthmus of Corinth was of major importance because it connected what otherwise would be the island of the Peloponnese with the rest of the Greek peninsula. Isthmuses are of great importance in plant and animal geography because they offer a path for the migration of land plants and animals between the two land masses they connect.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences for isthmus
The north is separated from the south by the neck, an isthmus of swampland.
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