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1. Oxford American Dictionary

   protractor

   • IPA[ˈprōˌtraktər]

   美式

   • n.
     an instrument for measuring angles, typically in the form of a flat semicircle marked with degrees along the curved edge.；a muscle serving to extend a part of the body.

   • noun: protractor, plural noun: protractors

2. • 更多解釋

   protractor

   • IPA[prəˈtraktə]

   英式

   • n.
     an instrument for measuring angles, typically in the form of a flat semicircle marked with ...

   Oxford Dictionary