bullroarer /ˈbʊlˌrɔːrə/

• 1. 

  N a wooden slat attached to a thong that makes a roaring sound when the thong is whirled: used esp by native Australians in religious rites 吼板; 澳大利亚原住民在宗教仪式中使用的木板乐器，抡甩木板系带可发出吼声