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corundum |
Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia, Hutchinson | 0.07 sec. |
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corundum /co·run·dum/ (kor-un´dum) native aluminum oxide, Al2O3, used in dentistry as an abrasive and polishing agent. corundum, n See emery. |
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Ash piping, chutes, fan blades, air separators lined with Abresist fused cast basalt, alumina ceramic or Kalcor alumina zirconia corundum. Its densely packed atoms make corundum Earth's second-hardest mineral. Another hypothesis for the polish on the Stone Age corundum ax head is that the Stone Age people never had absolutely pure corundum, which indeed would have required diamond to polish ("In the Buff: Stone Age tools may have derived luster from diamond" SN: 2/19/05, p. |
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corundum
