fathom /fadhˈəm/

1. Orig the reach of the outstretched arms
2. Now a unit of measurement for the depth of water, equal to 6 feet or 1.8 metres
3. Penetration of mind
4. A timber measure equal to 216 cubic feet

1. To discover the depth of
2. To comprehend or get to the bottom of
3. To measure or encompass with outstretched arms (archaic)

• pilot lamps
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• Piltdown man
• pilula