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fathom line

noun
variants: or less commonly fathom curve

Definition of fathom line 

: a usually sinuous line on a nautical chart joining all points having the same depth of water and thereby indicating the contour of the ocean floor

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Dictionary Entries near fathom line

fathom

Fathometer

fathomless

fathom line

fatidic

fatigable

fatigate

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