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1911 Encyclopedia Britannica
(Gr.tvOµos, neck), a narrow neck of land connecting two larger portions of land that are otherwise separated by the sea.
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Chisholm, Hugh, General Editor. Entry for 'Isthmus'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/i/isthmus.html. 1910.