CORUNDUM

noun
13 Scrabble
18 WWF
C 3
O 1
R 1
U 1
N 1
D 2
U 1
M 3

Definition

An extremely hard mineral, a form of aluminum oxide with the chemical formula Al2O3, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive.

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