εἰδέναι
From LSJ
Ἡ δ' ἐμὴ ψυχὴ πάλαι τέθνηκεν, ὥστε τοῖς θανοῦσιν ὠφελεῖν → My soul died long ago so that I could give some help to the dead
German (Pape)
[Seite 723] optat. u. inf. zu οἶδα.
French (Bailly abrégé)
inf. pf.2 de *εἴδω.
Russian (Dvoretsky)
εἰδέναι: inf. pf. к *εἴδω.
Greek > English (Woodhouse Verbs Reversed)
(see also οἶδα): know, be acquainted with, be aware of, be conscious of, know how to, solve riddle