(·p.pr. & ·vb.n.) of roar.
2. 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.
3. 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, ·vi, 5.