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isthmus

[is-muh s]
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noun, plural isth·mus·es, isth·mi [is-mahy] /ˈɪs maɪ/.
  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.
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Origin of isthmus

1545–55; < Latin < Greek isthmós neck (of land)
Related formsisth·moid, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for isthmi

isthmus

noun plural -muses or -mi (-maɪ)
  1. a narrow strip of land connecting two relatively large land areas
  2. anatomy
    1. a narrow band of tissue connecting two larger parts of a structure
    2. a narrow passage connecting two cavities
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Derived Formsisthmoid, adjective

Word Origin

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

Word Origin and History for isthmi

isthmus

n.

1550s, from Latin isthmus, from Greek isthmos "narrow passage, narrow neck of land," especially that of Corinth, of unknown origin, perhaps from eimi "to go" + suffix -thmo (cf. ithma "a step, movement").

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Online Etymology Dictionary, © 2010 Douglas Harper

isthmi in Medicine

isthmus

(ĭsməs)
n. pl. isth•mus•es
  1. A constriction or narrow passage connecting two larger parts of an organ or other anatomical structure.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

isthmi in Science

isthmus

[ĭsməs]
Plural isthmuses isthmi (ĭsmī′)
  1. A narrow strip of land connecting two larger masses of land.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

isthmi in Culture

isthmus

[(is-muhs)]

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

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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.