Definition of "bullroarer"

So far he was on the track of elementary Science. And so he made "bull-roarers" to imitate the sound of wind and the blessed rain-bringing thunder, or clashed great bronze cymbals together with the same object.

1920, Edward Carpenter, Pagan and Christian Creeds, New York: Harcourt, Brace and Co., published 1921, page 72

The men and boys practiced not only the technique of twirling the bullroarer, but also the mock attack staged upon the person twirling it.

1980, Donald F. Tuzin, The Voice of the Tambaran: Truth and Illusion in Ilahita Arapesh Religion‎, page 61

Frazer's ingenious theorizing is plausible as far as it goes, but it does not really explain why the bullroarer must be kept from women, the feature of the bullroarer complex that most troubled Lowie. Women are allowed to hear the sound of the bullroarer—indeed, the bullroarer is often used to warn women to keep away.

1980, Alan Dundes, Interpreting Folklore‎, page 181

Intrinsic to the propulsion of the bullroarer is the string and the hole the string is attached to. The average distance from the base to the center of the hole on the bullroarers under study is 0.9 cm. The placement of the hole is exceedingly important.

1999, Tom Hackett, “Bullroarers”, in David Wescott, editor, Primitive Technology: A Book of Earth Skills, page 133