fathom

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fathom

1. a unit of length equal to six feet (1.829 metres), used to measure depths of water
2. Forestry a unit of volume equal to six cubic feet, used for measuring timber
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

fathom

[′fath·əm]
(oceanography)
The common unit of depth in the ocean, equal to 6 feet (1.8288 meters).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.