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co·run·dum
 corundum
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- pronunciation:
- k
ruhn
dm
- features:
- Word Combinations (noun)
| part of speech: |
noun |
| definition: |
an exceedingly hard mineral, aluminum oxide, occurring commonly in gray, brown, or blue varieties which are used esp. as abrasives, and more rarely in transparent, crystalline forms such as the ruby and sapphire used in expensive jewelry.
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