Al ‧ len key /ˈælən kiː/ BrE AmE noun [countable] British English
[ Date: 1900-2000 ; Origin: From the Allen Manufacturing Company of Hartford, Connecticut, ↑ USA ]
a tool used to turn an Allen screw SYN Allen wrench American English
Al ‧ len key /ˈælən kiː/ BrE AmE noun [countable] British English
[ Date: 1900-2000 ; Origin: From the Allen Manufacturing Company of Hartford, Connecticut, ↑ USA ]
a tool used to turn an Allen screw SYN Allen wrench American English
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012