μόνῃ

From LSJ

κραδίη δέ μοι ἔξω στηθέων ἐκθρῴσκει → my heart is leaping forth from my bosom, be panic-stricken, my heart is beating outside my chest

Source

Russian (Dvoretsky)

μόνῃ: adv. Plut. = μόνον.