A long, loud, deep shout, as of rage or laughter, made with the mouth wide open.

The cry of the lion.

The deep cry of the bull.

To make a loud, deep cry, especially from pain, anger, or other strong emotion.

To laugh in a particularly loud manner.

“The audience roared at his jokes.”

Of animals (especially the lion), to make a loud deep noise.

“The lioness roared to scare off the hyenas.”