noun
: an alloy tool steel which when heat-treated retains much of its hardness and toughness at red heat thus enabling tools made of it to cut at high speeds even though red-hot through friction
noun
: an alloy tool steel which when heat-treated retains much of its hardness and toughness at red heat thus enabling tools made of it to cut at high speeds even though red-hot through friction
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012