Entry 3 senses Webster, 1913 Roarer · Roar·er · IPA 01 n. One who, or that which, roars. 1. One who, or that which, roars. “A lady to turn roarer, and break glasses.” — Massinger. 2. A horse subject to roaring. See Roaring, 2.(Far.) See: Roaring 3. The barn owl.(Zool.) [Prov. Eng.]