Strong’s Greek
G3455 — mukaomai
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
μυκάομαι
mukaomai — pronounced moo-kah'-om-ahee
from a presumed derivative of muzo ( to "moo"); to bellow (roar):--roar.
1 occurrence in the KJV.
Revelation 10:3
And cried with a loud voice, as when a lion roareth: and when he had cried, seven thunders uttered their voices.