κρόσσαι
From LSJ
Ἅγιος ὁ Θεός, Ἅγιος ἰσχυρός, Ἅγιος ἀθάνατος, ἐλέησον ἡμᾶς → holy God, holy Mighty, holy Immortal, have mercy on us
English (LSJ)
ῶν, αἱ, prob. =
A stepped copings of parapets, κρόσσας μὲν πύργων ἔρυον καὶ ἔρειπον ἐπάλξεις Il.12.258; κροσσάων ἐπέβαινον ib.444 (expld. by Aristarch. as scaling ladders). 2 courses, steps of the Pyramids, Hdt.2.125.