carborundum

• POS: Noun
• HYPHEN: Car=bo=run=dum

CIDE DICTIONARY

carborundum,  [a trade name, from Carbon + corundum.].

 A beautiful crystalline compound, silicon carbide (SiC), consisting of carbon and silicon in combination; -- also called carbon silicide. It is made by heating carbon and sand together in an electric furnace. The commercial article is dark-colored and iridescent. It is harder than emery, and is used as an abrasive.  [Webster 1913 Suppl.]

OXFORD DICTIONARY

carborundum, n. a compound of carbon and silicon used esp. as an abrasive.

Etymology

CARBON + CORUNDUM