vertex          
noun [ C ] uk/ˈvɜː.teks/ us/ˈvɝː.t̬eks/  vertices /ˈvɜː.te.siːz/ /ˈvɝː.t̬e.siːz/ vertexes
 mathematics specialized(数学里的)顶点,角顶 
(in mathematics) the point where two lines meet to form an angle, or the point that is opposite the base of a shape
  the vertex of a triangle/cone/pyramid 三角形/圆锥体/棱锥体的顶点 
  mathematics specialized顶点;最高点 
the highest point of something
 Synonyms: apex (SUCCESS) peak (HIGHEST POINT)pinnacle (SUCCESS)the summittop (HIGHEST PART)zenith (MOST SUCCESSFUL POINT)