Etymology
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isthmus (n.)

1550s, from Latin isthmus, from Greek isthmos "narrow passage, narrow neck of land between two seas," originally especially that of Corinth, a word of unknown origin. Perhaps from eimi "to go" + suffix -thmo (compare ithma "a step, movement").

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Definitions of isthmus

isthmus (n.)
a relatively narrow strip of land (with water on both sides) connecting two larger land areas;
isthmus (n.)
a cord-like tissue connecting two larger parts of an anatomical structure;
Synonyms: band
From wordnet.princeton.edu