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

Allen screw™

noun
 
/ˈælən skruː/
 
/ˈælən skruː/
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  1. a screw with a hole that has six sides in the top part
    Word Origin1930s: from the name of the manufacturer, the Allen Manufacturing Company, of Hartford, Connecticut.
See Allen screw in the Oxford Advanced American Dictionary
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