ἀκάτειος
From LSJ
κεραυνὸν ἐν γλώττῃ φέρειν → carry a thunderbolt on his tongue
English (LSJ)
ον, prop.
A belonging to an ἄκατος, q. v.; esp. ἀ. ἱστός foremast, IG2.793, etc.; ἀ. κεραία yard belonging thereto, ib., cf. Poll. 1.91. II Subst. ἀκάτειον, τό, (sc. ἱστίον) small sail, opp. τὰ μεγάλα ἱστία, X.HG6.2.27, Epicr.10 (with play on ἄκατος 11), cf. Luc.Lex.15, J. Tr.46, Hist. Conscr.45; ἄρασθαι τὸ ἀ., i.e. take to flight, prob. l. for ἀκάτιον in Epicur.Fr.163, cf. Ar.Lys.64.
Greek (Liddell-Scott)
ἀκάτειος: ἱστός, ἀκάτειος κεραία, Ἐπιγρ. Ἀθηνῶν. Rang. Ant. Hell. 2343a. - Ἐν τοῖς συγγραφεῦσιν εὕρηται μόνον ἡ διὰ τοῦ ἰῶτα γραφή.