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)