ἴσθμιος
From LSJ
καὶ λέγων ὅτι Πεπλήρωται ὁ καιρὸς καὶ ἤγγικεν ἡ βασιλεία τοῦ θεοῦ· μετανοεῖτε καὶ πιστεύετε ἐν τῷ εὐαγγελίῳ → declaring “The time has been accomplished and the kingdom of God is near: start repenting and believing in the gospel!” (Μark 1:15)
English (LSJ)
α, ον, also ος, ον E.Tr.1098 (lyr.):—
A of or belonging to the Isthmus, Isthmian, Ποτειδᾶν Pi.O.13.4; χθών S.OT940.