Dictionary entry

μυκάομαι

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

** μυκάομαι, -ῶμαι, in cl. chiefly poët.,

[in Sm.: Jb 6:5*;]

prop., of oxen (onomatop.), to low, bellow; of a lion, to roar: Re 10:3.†