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chalcogen

[kal-kuh-juh n, -jen] /ˈkæl kə dʒən, -ˌdʒɛn/
noun
1.
Chemistry. any of the elements oxygen, sulfur, selenium, tellurium, and polonium, which form the VIa group in the periodic table.
Origin
1960-1965
1960-65; chalcho- + -gen
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for chalcogen

chalcogen

/ˈkælkəˌdʒɛn/
noun
1.
any of the elements oxygen, sulphur, selenium, tellurium, or polonium, of group 6A of the periodic table
Word Origin
C20: from chalco(pyrite) + -gen
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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