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From LSJ

Ἅγιος ὁ Θεός, Ἅγιος ἰσχυρός, Ἅγιος ἀθάνατος, ἐλέησον ἡμᾶςholy God, holy Mighty, holy Immortal, have mercy on us

Source

Russian > Greek

ῥάδιξ, κεραία, ἀκρεμών