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English word:    

fthm

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fthm in WordNet English dictionary

noun
  1. a linear unit of measurement (equal to 6 feet) for water depth
    fathom  fthm 
  2. (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore
    fathom  fthm 
WordNet Lexical Database v3.0, © 2006 Princeton University