Longman Dictionary of Contemporary English homepage

ruler

 noun
     
Related topics: Maths, Officials, Measurement, Tools
rul‧er [countable]
1PGO someone such as a king or queen who has official power over a country or area
ruler
2DHH a long flat straight piece of plastic, metal, or wood that you use for measuring things or drawing straight lines:
a 12-inch ruler
Definition from the Longman Dictionary of Contemporary English
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