noun🔗Shareकोरन्डमAn 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."Because of its hardness, corundum is used in sandpaper to smooth rough wood. "अपनी कठोरता के कारण, कोरन्डम का उपयोग खुरदरे लकड़ी को चिकना करने के लिए सैंडपेपर में किया जाता है।mineralmaterialgeologysubstancechemistryscienceChat with AIVocabulary GamePractice Reading
