A record or graphic representation produced by a fathometer; a chart showing underwater depth measurements.
Compound of 'fathom' and '-gram' (a suffix meaning a written record or graphic representation, as in 'telegram' or 'sonogram'). It refers to the output of depth-measuring equipment.
The '-gram' suffix (from Greek 'graphia,' writing) appears in scientific instruments that 'write' their measurements—a fathogram literally lets you see the ocean floor as a line on paper.
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