from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A rounded mass, as of flint in chalk, or of ironstone in coal.

from The Century Dictionary and Cyclopedia

  • n. Same as niblick.
  • n. In mining and geology, a nodule or concretion, such as flint or pyrite, in some other and usually softer rock, as chalk, clay, or coal.


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