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co·run·dum (ko-runґdəm) naturally occurring aluminum oxide; used in dentistry as an abrasive in grinding wheels and for points mounted on mandrels for the dental engine. See also emery.Medical dictionary. 2011.
Corundum — General Category Oxide mineral – Hematite group Chemical formula Alumi … Wikipedia
Corundum — Co*run dum (k[ o]*r[u^]n d[u^]m), n.; pl. {Corundums} (k[ o]*r[u^]n d[u^]mz). [Also corindon.] [From Hind. kurand corundum stone.] (Min.) The mineral alumina ({Al2O3}), as found native in a crystalline state. Transparent varieties are used as… … The Collaborative International Dictionary of English
corundum — very hard mineral, 1728, from Anglo Indian, from Tamil kurundam ruby sapphire (Skt. kuruvinda), of unknown origin … Etymology dictionary
corundum — ► NOUN ▪ extremely hard crystallized alumina, used as an abrasive. ORIGIN Tamil … English terms dictionary
corundum — [kə run′dəm] n. [Tamil kurundam < Sans kuruvinda, ruby] a very hard mineral, aluminum oxide, Al2O3: a dark, coarse variety ( emery) is used for grinding and polishing; clear, transparent varieties ( ruby, sapphire) are used as gems: see MOHS… … English World dictionary
corundum — /keuh run deuhm/, n. a common mineral, aluminum oxide, Al2O3, notable for its hardness: transparent varieties, as sapphire and ruby, are used as gems, other varieties as abrasives: often made synthetically. [1720 30; < Tamil kuruntam; akin to Skt … Universalium
corundum — korundas statusas T sritis radioelektronika atitikmenys: angl. corundum vok. Korund, m rus. корунд, m pranc. corindon, m … Radioelektronikos terminų žodynas
corundum — korundas statusas T sritis chemija apibrėžtis Mineralas. formulė Al₂O₃ atitikmenys: angl. corundum rus. корунд … Chemijos terminų aiškinamasis žodynas
corundum — noun Etymology: Tamil kuruntam; akin to Sanskrit kuruvinda ruby Date: 1804 a very hard mineral that consists of aluminum oxide occurring in massive and crystalline forms, that can be synthesized, and that is used for gemstones (as ruby and… … New Collegiate Dictionary
corundum — noun an extremely hard mineral, a form of aluminium oxide with the chemical formula AlO, that occurs in the form of the gemstones ruby and sapphire; it is used as an abrasive … Wiktionary
