βοηθητέος

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

Source

French (Bailly abrégé)

α, ον :
adj. verb. de βοηθέω.

Spanish (DGE)

-α, -ον
que debe ser ayudadoἀνήρ Iul.Or.7.229a, cf. Gr.Naz.Ep.104.3.

Middle Liddell

βοηθέω
one must help, Xen., Dem.