from the GNU version of the Collaborative International Dictionary of English

  • n. A hydrous oxide of iron (HFeO2), occurring in prismatic crystals, also massive, with a fibrous, reniform, or stalactitic structure. The color varies from yellowish to blackish brown.

from The Century Dictionary and Cyclopedia

  • n. Same as goethite.

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

  • n. a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust


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