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  1. A small excavation or hole made to improve ventilation by communication with other workings or with the surface. See also: cundy
  2. A venthole in the upper end of the inner tube of a double-tube core barrel to allow air and/or water entrapped by the advancing core to escape. Long
  3. A void, cavity, or flaw in a casting or bit crown. Long
    Source: Dictionary of Mining, Mineral, and Related Terms

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