protractor
noun [ C ] uk/prəˈtræk.tər/ us/prəˈtræk.tɚ/
量角器；分度规
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.
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。