Lexical Definition

‎μυκάομαι‎ mykáomai (moo-kah'-om-ahee) to roar ^G:V
from a presumed derivative of ( to "moo")

roar.

• to bellow (roar)

Abbott-Smith

** 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.†

Abbott-Smith References

Liddell-Scott-Jones

μυκάομαι,

future -ήσομαι [Refs 2nd c.AD+]: aorist ἐμῡκησάμην [Refs 8th c.BC+] once in present participle, [Refs 8th c.BC+], elsewhere in Epic dialect aorist μύκον [ῠ], Epic dialect perfect μέμῡκα (also in [Refs 4th c.BC+]: pluperfect ἐμεμύκειν or μεμύκειν [Refs 8th c.BC+]:—properly of oxen, low, bellow, ὁ δὲ μακρὰ μεμυκώς [ὁ ταῦρος] [Refs 8th c.BC+]; of a calf, Theoc. [prev. cited]; of Heracles in agony, [NT+5th c.BC+]

__2 of things, πύλαι μύκον οὐρανοῦ [Refs 8th c.BC+]; of a shield, μέγα δ᾽ ἀμφὶ σάκος μύκε δουρὸς ἀκωκῇ rang, [Refs]; of meat, ἀμφ᾽ ὀβελοῖσι μεμύκει bellowed upon the spits (a portent), [Refs 8th c.BC+]—An aorist active, [τυμπάνου] βαρὺ μυκήσαντος [Refs 3rd c.BC+]

_{LSJ Scripture Refs: Rev.10.3}