1883W. H. H. Hudson in Nature XXVIII. 7, I beg leave to suggest the following names: circumcircle, incircle, excircle, and midcircle.
英语词典包含277258条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。