Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A steel-gray mineral, chiefly Bi2Te2S.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a grey mineral that is mostly a mixed sulfide of bismuth and tellurium

from the GNU version of the Collaborative International Dictionary of English

  • n. A telluride of bismuth. It is of a pale steel-gray color and metallic luster, and usually occurs in foliated masses. Called also telluric bismuth.

from The Century Dictionary and Cyclopedia

  • n. Native bismuth telluride, containing also some sulphur, a mineral occurring in foliated masses of a pale steel-gray color and brilliant metallic luster. Also called telluric bismuth, tellur - bismuth, and bornine.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

German Tetradymit, from Late Greek tetradumos, fourfold (from the double twin crystals in which it usually is found) : Greek tetra-, tetra- + didumos, double; see dwo- in Indo-European roots.

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