carborundum means crystals of silicon carbide used as an abrasive. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
noun
- Crystals of silicon carbide used as an abrasive.“There is no doubt that such a button — properly prepared under great pressure — of carborundum, especially of powder of the best quality, will withstand the effect of the bombardment fully as well as anything we know.”