noun Télécharger 🔗Partager Corindon 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. Examples : "Because of its hardness, corundum is used in sandpaper to smooth rough wood. " En raison de sa dureté, le corindon est utilisé dans le papier de verre pour lisser le bois brut. mineral material geology substance chemistry science Chat avec IAJeu de vocabulairePratiquer la lecture