corundum

Native crystalline aluminum oxide. [Hind. kurand]

* * *

co·run·dum kə-'rən-dəm n a very hard mineral Al2O3 that consists of alumina occurring in massive form and as variously colored crystals which include the ruby and sapphire

* * *

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.

Look at other dictionaries:

  • 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

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.