corundum

[ kuh-ruhn-duhm ]

/ kəˈrʌn dəm /

SEE SYNONYMS FOR corundum ON THESAURUS.COM

noun

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.

Origin of corundum

1720–30; <Tamil kuruntam; akin to Sanskrit kuruvinda ruby

Words nearby corundum

cor triatriatum, cor triloculare, Cortrosyn, Corumbá, Coruña, corundum, Corunna, coruscant, coruscate, coruscation, Corvallis

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for corundum

Copper ore is found in many tracts throughout India, plumbago in Madras, and corundum in southern India.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 4|Various
Corundum is a mineral similar to emery, and corundum wheels are made and used in the same manner as emery wheels.
Modern Machine-Shop Practice, Volumes I and II|Joshua Rose
Canadian corundum occurs as a constituent of syenite and nepheline-syenite in Lower Ontario.
The Economic Aspect of Geology|C. K. Leith
It is interesting to note that the corundum gems undergo marked change in color under the influence of radium.
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public|Frank Bertram Wade

While Corundum of all colors is used for gems, it is only that which is transparent which can be so employed.
Birds and Nature, Vol. 12 No. 5 [December 1902]|Various

British Dictionary definitions for corundum

corundum

/ (kəˈrʌndəm) /

noun

a white, grey, blue, green, red, yellow, or brown mineral, found in metamorphosed shales and limestones, in veins, and in some igneous rocks. It is used as an abrasive and as gemstone; the red variety is ruby, the blue is sapphire. Composition: aluminium oxide. Formula: Al 2 O 3 . Crystal structure: hexagonal (rhombohedral)

Word Origin for corundum

C18: from Tamil kuruntam; related to Sanskrit kuruvinda ruby

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for corundum

corundum

[ kə-rŭn′dəm ]

An extremely hard mineral occurring in many colors, either as shapeless grains or as rhombohedral crystals. It also occurs in gem varieties such as ruby and sapphire and in a dark-colored variety that is used for polishing and scraping. Corundum is found in igneous and carbonate rocks. Chemical formula: Al2O3.

单词	corundum
释义	corundum [ kuh-ruhn-duhm ] / kəˈrʌn dəm / SEE SYNONYMS FOR corundum ON THESAURUS.COM noun 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. Origin of corundum 1720–30; <Tamil kuruntam; akin to Sanskrit kuruvinda ruby Words nearby corundum cor triatriatum, cor triloculare, Cortrosyn, Corumbá, Coruña, corundum, Corunna, coruscant, coruscate, coruscation, Corvallis Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for corundum Copper ore is found in many tracts throughout India, plumbago in Madras, and corundum in southern India. Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 4\|Various Corundum is a mineral similar to emery, and corundum wheels are made and used in the same manner as emery wheels. Modern Machine-Shop Practice, Volumes I and II\|Joshua Rose Canadian corundum occurs as a constituent of syenite and nepheline-syenite in Lower Ontario. The Economic Aspect of Geology\|C. K. Leith It is interesting to note that the corundum gems undergo marked change in color under the influence of radium. A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public\|Frank Bertram Wade While Corundum of all colors is used for gems, it is only that which is transparent which can be so employed. Birds and Nature, Vol. 12 No. 5 [December 1902]\|Various British Dictionary definitions for corundum corundum / (kəˈrʌndəm) / noun a white, grey, blue, green, red, yellow, or brown mineral, found in metamorphosed shales and limestones, in veins, and in some igneous rocks. It is used as an abrasive and as gemstone; the red variety is ruby, the blue is sapphire. Composition: aluminium oxide. Formula: Al 2 O 3 . Crystal structure: hexagonal (rhombohedral) Word Origin for corundum C18: from Tamil kuruntam; related to Sanskrit kuruvinda ruby Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Words related to corundum jewel, gem, rhinestone, paragon, ice, lozenge, rock, zircon, rhombus, allotrope, solitaire, brilliant, bort, jager Scientific definitions for corundum corundum [ kə-rŭn′dəm ] An extremely hard mineral occurring in many colors, either as shapeless grains or as rhombohedral crystals. It also occurs in gem varieties such as ruby and sapphire and in a dark-colored variety that is used for polishing and scraping. Corundum is found in igneous and carbonate rocks. Chemical formula: Al2O3. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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corundum

noun

Origin of corundum

Words nearby corundum

Example sentences from the Web for corundum

British Dictionary definitions for corundum

noun

Word Origin for corundum

Words related to corundum

Scientific definitions for corundum