valedictorian
noun [ C ] US uk/ˌvæl.ə.dɪkˈtɔː.ri.ən/ us/ˌvæl.ə.dɪkˈtɔːr.i.ən/
（毕业典礼上）致告别辞的优秀生
a student who has the highest grades in his or her graduating class in high school and who makes a speech at the graduation ceremony
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。