Definition of Allen key™ noun from the Oxford Advanced Learner's Dictionary

 

Allen key™

 noun
noun
BrE BrE//ˈælən kiː//
 
; NAmE NAmE//ˈælən kiː//
 
(British English)(North American English Allen wrench™)
 
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a small tool used for turning an Allen screw™ Word Origin 1960s: from the name of the manufacturer, the Allen Manufacturing Company, of Hartford, Connecticut.