ἑξηκοντάκι
From LSJ
αἰθὴρ δ᾽ ἐλαφραῖς πτερύγων ῥιπαῖς ὑποσυρίζει (Aeschylus, Prometheus Bound 126) → The bright air fanned | whistles and shrills with rapid beat of wings.
English (LSJ)
poet. for ἑξηκοντάκις.
Russian (Dvoretsky)
ἑξηκοντάκι: (ς) (ᾰ) adv. шестьдесят раз Pind.