Definitions for roaringˈrɔr ɪŋ, ˈroʊr-

roar•ingˈrɔr ɪŋ, ˈroʊr-(n.)

the act of a person, animal, or thing that roars.
one or more loud, deep cries or sounds.
a disease of horses caused by respiratory obstruction or vocal cord paralysis and characterized by loud breathing.
Category: Veterinary Science
(adj.)making or causing a roar, as thunder.
Category: Animal Behavior
brisk; active:
a roaring business.
complete; utter:
a roaring idiot.
(adv.)very:
roaring drunk.

bef. 1000

boom, roar, roaring, thunder(noun)
a deep prolonged loud noise
bellow, bellowing, holla, holler, hollering, hollo, holloa, roar, roaring, yowl(adj)
a very loud utterance (like the sound of an animal)
"his bellow filled the hallway"
booming, flourishing, palmy, prospering, prosperous, roaring, thriving(adverb)
very lively and profitable
"flourishing businesses"; "a palmy time for stockbrokers"; "a prosperous new business"; "doing a roaring trade"; "a thriving tourist center"; "did a thriving business in orchids"
roaring(adverb)
extremely
"roaring drunk"

Roaring(u)
of Roar
Roaring(noun)
a loud, deep, prolonged sound, as of a large beast, or of a person in distress, anger, mirth, etc., or of a noisy congregation
Roaring(noun)
an affection of the windpipe of a horse, causing a loud, peculiar noise in breathing under exertion; the making of the noise so caused. See Roar, v. i., 5

Roaring
A term applied to the noise sometimes produced in a voltaic arc, when the electrodes are close together and a heavy current is passing.

Citation

"roaring." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/roaring>.