'Isthmus' definitions:

Definition of 'isthmus'

From: WordNet
noun
A relatively narrow strip of land (with water on both sides) connecting two larger land areas
noun
A cord-like tissue connecting two larger parts of an anatomical structure [syn: isthmus, band]

Definition of 'Isthmus'

From: GCIDE
  • Isthmus \Isth"mus\ (?; 277), n.; pl. Isthmuses. [L. isthmus, Gr. 'isqmo`s a neck, a neck of land between two seas, an isthmus, especially the Isthmus of Corinth; prob. from the root of 'ie`nai to go; cf. Icel. ei[eth] isthmus. See Issue.] (Geog.) A neck or narrow slip of land by which two continents are connected, or by which a peninsula is united to the mainland; as, the Isthmus of Panama; the Isthmus of Suez, etc. [1913 Webster]
  • Isthmus of the fauces. (Anat.) See Fauces. [1913 Webster]