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[is-muh s] /ˈɪs məs/

noun, plural isthmuses, isthmi
[is-mahy] /ˈɪs maɪ/ (Show IPA)
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.
noun (pl) -muses, -mi (-maɪ)
a narrow strip of land connecting two relatively large land areas


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”).

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.
Plural isthmuses or isthmi (ĭs’mī’)
A narrow strip of land connecting two larger masses of land.
isthmus [(is-muhs)]

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


Read Also:

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  • Isthmus of fauces

    isthmus of fauces n. The constricted space that connects the cavity of the mouth and the pharynx.

  • Isthmus of thyroid

    isthmus of thyroid n. The central part of the thyroid gland that joins the two lateral lobes.

  • Isthmus of uterine tube

    isthmus of uterine tube n. The narrow portion of the uterine tube adjoining the uterus.

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