τρίπλεθρος
From LSJ
ἀσκέειν, περὶ τὰ νουσήματα, δύο, ὠφελέειν, ἢ μὴ βλάπτειν → strive, with regard to diseases, for two things — to do good, or to do no harm | as to diseases, make a habit of two things — to help, or at least, to do no harm
English (LSJ)
ον,
A three πλέθρα wide, Pl.Criti.115d, X.An.5.6.9, Inscr.Cret.1. v 21 (Arcades, ii B. C.).
German (Pape)
[Seite 1145] drei πλέθρα lang; Plat. Critia. 115 ό; Xen. An. 5, 6, 9.