Function: noun
Date: circa 1794
: a bolt that has a nut with wings which close for passage through a small hole and spring open after passing through the hole to keep the bolt from slipping back through
Function: noun
Date: circa 1794
: a bolt that has a nut with wings which close for passage through a small hole and spring open after passing through the hole to keep the bolt from slipping back through
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012