heelball /ˈhiːlˌbɔːl/

• 1.  

  N（名词） a black waxy substance used by shoemakers to blacken the edges of heels and soles 蜡墨; 擦鞋跟或鞋底用
• 2.  

  N（名词） a similar substance used to take rubbings, esp brass rubbings 尤指黄铜拓印使用的类似涂材