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

  • n. A nonmagnetic variety of the mineral pyrrhotite, FeS, present in almost all meteorites and having almost no ferrous iron deficiency.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A non-magnetic variety of the ferrous sulfide mineral pyrrhotite that occurs in most meteorites

from the GNU version of the Collaborative International Dictionary of English

  • n. Native iron protosulphide, FeS. It is known only in meteoric irons, and is usually in imbedded nodular masses of a bronze color.

from The Century Dictionary and Cyclopedia

  • n. A native iron sulphid often occurring in meteorites, and especially meteoric irons, as embedded nodules or generally disseminated.


After D. Troili, 18th-century Italian scientist.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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