Definition of tool steel
1 : hard usually electric steel capable of being tempered so as to be especially suitable as a material for tools
2 : a high-carbon or alloy steel used to make a cutting tool for machining metals
3 : steel used to make tools and dies for various purposes (as press tools, die-casting dies, forging dies, or extrusion tools)
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up tool steel? Please tell us where you read or heard it (including the quote, if possible).