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margin line

noun, Nautical
1.
an imaginary line used in making calculations regarding the flooding of hulls, running fore-and-aft 3 inches (8 cm) below the upper surface of the bulkhead deck at the side.
2.
the line along which the planking on a transom-sterned vessel terminates aft.
Origin of margin line
1840-1850
1840-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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