ἀντιφονεύω
From LSJ
ἀναγκαιότεραι μὲν οὖν πᾶσαι ταύτης, ἀμείνων δ᾽ οὐδεμία → accordingly, although all other sciences are more necessary than this, none is more excellent (Aristotle, Metaphysics A 983a10)
English (LSJ)
A murder in return, Sch.E.Or.415.
Greek (Liddell-Scott)
ἀντιφονεύω: ἀνταποδίδω φόνον ἀντὶ φόνου, Σχόλ. εἰς Εὐρ. Ὀρ. 415, Ἐπιφάν.