toreutics
noun
to·reu·tics tə-ˈrü-tiks 
plural in form but singular in construction
: the art or process of working in metal especially by embossing or chasing
toreutic
tə-ˈrü-tik
adjective 
Word History
Etymology
toreutic, adjective, from Greek toreutikos, from toreuein to bore through, chase, from toreus boring tool; akin to Greek tetrainein to bore — more at throw entry 1
First Known Use
1847, in the meaning defined above