Carborundum

[ kahr-buh-ruhn-duh m ]
/ ˌkɑr bəˈrʌn dəm /

Trademark.

any of various abrasives or refractories of silicon carbide, fused alumina, and other materials.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for carborundum

Carborundum

/ (ˌkɑːbəˈrʌndəm) /

noun

trademark
  1. any of various abrasive materials, esp one consisting of silicon carbide
  2. (as modifier)a Carborundum wheel
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012