[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.
A narrow strip of land that connects two larger bodies of land and has water on both sides.
- Isthmus of auditory tube
isthmus of auditory tube n. The narrowest portion of the auditory tube at the junction of the cartilaginous and bony portions. Also called isthmus of eustachian tube.
- 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.