From Longman Dictionary of Contemporary Englishprotractorpro‧trac‧tor /prəˈtræktə $ proʊˈtræktər/ noun [countable]
HMa piece of plastic in the shape of a half-circle, which is used for measuring and drawing angles → set square
![protractor.jpg](http://v2.kuroapp.com/resources/longman/english/images/protractor.jpg)
Examples from the Corpus
protractor• Moira screamed and ran away from him, dropping several books and a protractor.• After all, this is the unit used on the protractor that we first came across early in our school careers.