Ἰσθμοῖ

A. Ἰσθμός 11.2, Ar. Fr. 14D.:—usu. on the Isthmus: at the Isthmian games, IG 12.77, Pi. O. 13.98, Lys. 19.63, Timocr. 1.10; also ἐν Ἰσθμοῖ Simon. 125 cod. [Ἱσθ‐ IG 12.77,829; Ἰθμοῖ SIG 36 A (Delph., iv B.C.), but Ἰσθμοῖ ib.B (Olymp., v B.C.); cf. Ἰσθμός.]
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project