/ Dictionary / Index C Carborundum: Meaning and Definition of Find definitions for: Car•bo•run•dum Pronunciation: (kär"bu-run'dum), [key] — Trademark. Trademark. any of various abrasives or refractories of silicon carbide, fused alumina, and other materials. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: carborundum (Thesaurus) carborane carboxyl Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language