A loud cry, roar, or other vocal outburst made by a person or animal; noise or din made by the shouting, roaring, etc., of a person or animal. Also…

The roaring of a bull, or similar noise of other animals.

The action of roar, v.1; the utterance of a long loud deep sound; an instance of this. Of a thing (cf. roar, v.1 3).

The action of rout, v.4; bellowing, roaring; lowing of cattle. Also: an instance of this.

A loud, deep, prolonged sound made by something, as the sea, wind, heavy guns, traffic, etc.

Bellowing, roaring; a loud bellowing noise.

A thundering; a roaring or rumbling as of thunder.

A dull roaring noise.

The loud deep roar of cannon, thunder, a storm, and other inanimate agents.

An incipient roaring.