Noun fthm has 2 senses
  1. fathom, fthm - a linear unit of measurement (equal to 6 feet) for water depth
    --1 is a kind of linear unit
    --1 has parts: yard, pace
  2. fathom, fthm - (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore
    --2 is a kind of volume unit, capacity unit, capacity measure, cubage unit, cubic measure, cubic content unit, displacement unit, cubature unit
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