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

  • n. An ore of iron, FeCO3.
  • n. A meteorite consisting mainly of iron and nickel.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a widespread brown mineral, FeCO3, having the structure of calcite
  • n. an iron meteorite
  • n. An indigo-blue variety of quartz.
  • n. magnetic iron ore; lodestone

from the GNU version of the Collaborative International Dictionary of English

  • n.
  • n. Carbonate of iron, an important ore of iron occuring generally in cleavable masses, but also in rhombohedral crystals. It is of a light yellowish brown color. Called also sparry iron, spathic iron.
  • n. A meteorite consisting solely of metallic iron.
  • n. An indigo-blue variety of quartz.
  • n. Formerly, magnetic iron ore, or loadstone.
  • n. Any plant of the genus Sideritis; ironwort.

from The Century Dictionary and Cyclopedia

  • n. The lodestone.
  • n. Native iron protocarbonate, a mineral of a yellowish or brownish color, crystallizing in the rhombohedral system with perfect rhombohedral cleavage.
  • n. A meteorite consisting essentially of nickeliferous metallic iron. See meteorite.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. iron ore in the form of ferrous carbonate
  • n. a meteorite consisting principally of nickel and iron


Latin sideritis ("lodestone"), from Ancient Greek, of iron, from iron. (Wiktionary)



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