Webster’s Revised Unabridged Dictionary · 1913
Roarer
Roar′er (·ẽr), n. 1. One who, or that which, roars. Specifically: (a) A riotous fellow; a roaring boy.
A lady to turn roarer, and break glasses. Massinger.
(b) (Far.) A horse subject to roaring. See Roaring, 2.
2. (Zoöl.) The barn owl. [Prov. Eng.]