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English definition of “ruler”

ruler

noun [C] (FOR DRAWING)    /ˈruː.lər/ US  /-lɚ/ (old-fashioned or formal rule)
A2 a long, narrow, flat piece of plastic, metal, or wood with straight edges where centimetres or inches, or both are printed. It is used for measuring things and for drawing straight lines.Weighing, measuring and counting devices
(Definition of ruler noun (FOR DRAWING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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