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Definition of protractor noun from the Oxford Advanced American Dictionary

 

protractor

 noun
noun
NAmE//ˈproʊtræktər//
 
, NAmE//proʊˈtræktər//
 
 
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an instrument for measuring and drawing angles, usually made from a half circle of clear plastic with degrees (0° to 180°) marked on it
See the Oxford Advanced Learner's Dictionary entry: protractor