ἕκπλεθρος
From LSJ
λίγεια μινύρεται θαμίζουσα μάλιστ' ἀηδών → the sweet-voiced nightingale mourns constantly, the sweet-voiced nightingale most loves to warble
English (LSJ)
ον,
A six plethra long, Phryn.387 ; in ἕ. ἀγών, = στάδιον, E.El.883, and κῶλον ἕ. δρόμου Id.Med.1181 (where Sch. expl. μέγα καὶ ὑπερβαῖνον πλέθρου μέτρον) ἔ. is the better reading, narrowing.