εἰδῶ

From LSJ

κατὰ τὸ φιλόκαλον πειραθέντα κατανοῆσαι → see by working out the calculation

Source

French (Bailly abrégé)

ῇς, ῇ;
sbj. de οἶδα, pf.2 de *εἴδω.

Russian (Dvoretsky)

εἰδῶ: эп. εἰδέω pf. conjct. к *εἴδω.