helix      
noun [ C ] uk/ˈhiː.lɪks/ us/ˈhiː.lɪks/  helices
  (SHAPE)     
  mathematics specialized螺旋(形) 
a curve that goes around a central tube or cone shape in the form of a spiral
   (OF EAR)      
 anatomy specialized耳轮 
the curved edge around the top of the outer ear 
  The helix is a popular site for ear piercings. 耳轮是打耳孔的常用位置。 
 helical
adjective  specialized uk/ˈhiː.lɪ.kəl/ us/ˈhiː.lɪ.kəl/
 螺旋形的
in the shape of a helix
  helical molecules 螺旋形分子 
 a helical structure 螺旋结构