Allen key Meaning in the Cambridge English Dictionary
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Meaning of “Allen key” in the English Dictionary

"Allen key" in British English

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Allen keynoun [C]

uk   us   /ˈæl.ənˌkiː/ (also Allen wrench) trademark
an L-shaped ​metaltool with six ​sides that is used to ​turn a screw that has a six-sided ​hole in the ​top
(Definition of Allen key from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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