κατευθυντηρία
From LSJ
Εὐφήμει, ὦ ἄνθρωπε· ἁσμενέστατα μέντοι αὐτὸ ἀπέφυγον, ὥσπερ λυττῶντά τινα καὶ ἄγριον δεσπότην ἀποδράς → Hush, man, most gladly have I escaped this thing you talk of, as if I had run away from a raging and savage beast of a master
English (LSJ)
ἡ,
A carpenter's line, Sch.Il.15.410, EM740.42.
German (Pape)
[Seite 1398] ἡ, die Richtschnur, Schol. Il. 15, 410, Erkl. von στάθμη. Fem. von κατευθυντήριος, richtend, E. M. 740, 42.