ἐνεργήτρια
From LSJ
τῶν γὰρ μετρίων πρῶτα μὲν εἰπεῖν τοὔνομα νικᾷ → the first mention of the word moderation wins the game (Euripides, Medea 125f.)
English (LSJ)
ἡ,
A effectrix, Gloss.
Spanish (DGE)
-ας, ἡ
causante, que realiza ἐ.· effectrix, Gloss.2.298.