ἄρτιον

From LSJ

ὑπὸ δὲ οἴστρου ἀεὶ ἑλκομένη ψυχή → a soul always dragged along by the fury of passion

Source

Russian (Dvoretsky)

ἄρτιον: τό четное число (τὸ ἄ. καὶ τὸ περιττόν Arst., Plut.).