Associations to the word «Corundum»
Noun
Adjective
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Wiktionary
CORUNDUM, noun. (mineral) 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.
Dictionary definition
CORUNDUM, noun. Very hard mineral used as an abrasive.
Wise words
It is only with the heart that one can see rightly; what is
essential is invisible to the eye.