Dictionary.com

isthmus

[ is-muhs ]
/ ˈɪs məs /
Save This Word!

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.

QUIZZES

DO A DOUBLE TAKE ON THIS QUIZ ON CONTRONYMS

Look both ways before you take this quiz on contronyms, or words that can have opposite meanings.
Question 1 of 7
Choose the sentence that uses "rent" correctly.

Meet Grammar Coach

Write or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing

Meet Grammar Coach

Improve Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of isthmus

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

OTHER WORDS FROM isthmus

isthmoid, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for isthmus

British Dictionary definitions for isthmus

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 isthmus

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 isthmus

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 isthmus

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.
FEEDBACK