01 n. 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 …
pl.
Isthmuses ((#))
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1.
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.(Geog.)
Phrases & compounds
Isthmus of the fauces —
See Fauces.