Definition of fathom

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fath·om    (fm) KEY  

NOUN:
Abbr. fth. or fm.

A unit of length equal to 6 feet (1.83 meters), used principally in the measurement and specification of marine depths.

TRANSITIVE VERB:
fath·omed , fath·om·ing , fath·oms

1. To penetrate to the meaning or nature of; comprehend.
2. To determine the depth of; sound.

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ETYMOLOGY:
Middle English fathme, from Old English fæthm, outstretched arms; see pet- in Indo-European roots

OTHER FORMS:
fathom·a·ble (Adjective)

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