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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艾伦螺钉，六角螺钉（顶端有六角形孔）
    Word Origin1930s: from the name of the manufacturer, the Allen Manufacturing Company, of Hartford, Connecticut.