βοηθηματικός
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)
ή, όν,
A = βοηθητικός, Dsc.Alex.Praef., Gal.19.395.
German (Pape)
[Seite 451] = βοηθητικός, Diosc.