G3455
μυκάομαι
to roar
μυκάσμαι, -ῶμαι in cl. chiefly poët., [in Sm.: Job.6:5 * ;] prop., of oxen (onomatop.), to low, bellow; of a lion, to roar: Rev.10:3.† (AS)
The KJV translates G3455 in the following manner:
roareth (2x)
Full Thayer's lexicon entry
μυκάομαι — mykáomai
μυκάομαι, μυκωμαι; (from μύ or μύ, the sound which a cow utters (Latinmugio)), to low, bellow, properly, of horned cattle (Homer, Aeschylus, Euripides, Plato, others); to roar, of a lion, Rev 10:3.
1 occurrence