'Bull-roarer' definitions:

Definition of 'Bull-roarer'

From: GCIDE

Bull-roarer \Bull"-roar`er\, n. A contrivance consisting of a slat of wood tied to the end of a thong or string, with which the slat is whirled so as to cause an intermittent roaring noise. It is used as a toy, and among some races in certain religious rites. [Webster 1913 Suppl.]