isthmus

[ is-muh s ]
/ ˈɪs məs /

noun, plural isth·mus·es, isth·mi [is-mahy] /ˈɪs maɪ/.

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.

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Origin of isthmus

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

OTHER WORDS FROM isthmus

isth·moid, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for isthmi

isthmus
/ (ˈɪsməs) /

noun plural -muses or -mi (-maɪ)

a narrow strip of land connecting two relatively large land areas
anatomy
  1. a narrow band of tissue connecting two larger parts of a structure
  2. a narrow passage connecting two cavities

Derived forms of isthmus

isthmoid, adjective

Word Origin for isthmus

C16: from Latin, from Greek isthmos
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

Medical definitions for isthmi

isthmus
[ ĭsməs ]

n. pl. isth•mus•es

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.

Scientific definitions for isthmi

isthmus
[ ĭsməs ]

Plural isthmuses isthmi (ĭsmī′)

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 isthmi

isthmus
[ (is-muhs) ]

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.