Roar (?), n. The sound of roaring. Specifically: (a) The deep, loud cry of a wild beast; as, the roar of a lion. (b) The cry of one in pain, distress, anger, or the like. (c) A loud, continuous, and confused sound; as, the roar of a cannon, of the wind, or the waves; the roar of ocean.
Arm! arm! it is, it is the cannon's opening roar! Byron.
(d) A boisterous outcry or shouting, as in mirth.
Pit, boxes, and galleries were in a constant roar of laughter. Macaulay.