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Noun: fthm
  1. A linear unit of measurement (equal to 6 feet) for water depth
    - fathom
  2. (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore
    - fathom

Type of: capacity measure, capacity unit, cubage unit, cubature unit, cubic content unit, cubic measure, displacement unit, linear measure, linear unit, volume unit