Etymology
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isthmian (adj.)

c. 1600, from Latin isthmius, from Greek isthmios "pertaining to the isthmus (of Corinth)," from isthmos (see isthmus). Originally in reference to the Isthmian Games, held at Corinth in honor of Poseidon.

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Definitions of isthmian

isthmian (adj.)
of or relating to or forming an isthmus;
From wordnet.princeton.edu