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English definition of “Allen key”

Allen key

noun [C]     /ˈæl.ənˌkiː/ (also Allen wrench) trademark
an L-shaped metal tool with six sides that is used to turn a screw with a six-sided hole in the top ToolsGardening tools
(Definition of Allen key noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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