柯林斯詞典protractor /pr??tr?kt?/ (protractors) 1. N-COUNT A protractor is a flat, semicircular piece of plastic or metal that is used for measuring angles. 量角器; 分度規(guī) 返回 protractor劍橋詞典a device used for measuring and drawing angles . It is usually in the form of half a circle made from transparent plastic with degrees printed on it. 量角器；分度規(guī) 返回 protractor