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Isthmus

Origin: L. Isthmus, gr. 'isqmos a neck, a neck of land between two seas, an isthmus, especially the isthmus of Corinth; prob. From the root of 'ienai to go; cf. Icel. Eith isthmus. See Issue.

(Science: geography) 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. Isthmus of the fauces.

(Science: anatomy) see fauces.