ἐρισμάραγος

ον
A. loud-thundering, epith. of Zeus, Hes. Th. 815, IGRom. 4.360.13 (Pergam.), etc.; θάλασσα Musae. 318 ; ἀστραπή Luc. Tim. 1.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project