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tetradymite

[te-trad-uh-mahyt] /tɛˈtræd əˌmaɪt/
noun
1.
a mineral, bismuth telluride and sulfide, Bi 2 Te 2 S, occurring in soft-gray to black foliated masses.
Origin of tetradymite
1840-1850
1840-50; < Greek tetrádym(os) fourfold (see tetra-, didymous) + -ite1; modeled on German Tetradymit
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for tetradymite

tetradymite

/tɛˈtrædɪˌmaɪt/
noun
1.
a grey metallic mineral consisting of a telluride and sulphide of bismuth. Formula: Bi2Te2S
Word Origin
C19: from Late Greek tetradumos fourfold, from Greek tetra- + didumos double
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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