ἀρχινυκτοφύλαξ
From LSJ
γραμματική ἐστιν ἐμπειρία τῶν παρὰ ποιηταῖς τε καὶ συγγραφεῦσιν ὡς ἐπὶ τὸ πολὺ λεγομένων → grammar is a practical knowledge of the usage of poets and writers of prose
English (LSJ)
[ῠ], ὁ, A chief of night-guard, Sammelb.4636.33 (iii A. D.).
Spanish (DGE)
-ακος, ὁ
oficial de la guardia nocturna, SB 4636.33 (III d.C.).