Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A steel-gray mineral, chiefly Bi2Te2S.

from The Century Dictionary.

  • noun 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.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) 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 Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy a grey mineral that is mostly a mixed sulfide of bismuth and tellurium

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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